• Chemistry Help?

    Refer to the following image when answering this question: http://prntscr.com/fab40u Match the identity of "A" and "B", above, to the correct terms. Terms: 1. analyte 2. titrant
    Refer to the following image when answering this question: http://prntscr.com/fab40u Match the identity of "A" and "B", above, to the correct terms. Terms: 1. analyte 2. titrant
    1 answer · Chemistry · 11 months ago
  • Gen Chem 2 problem- please help? "What is the molarity of the solution?"?

    A solution of sodium acetate (NaCH3COO) has a pH of 9.65. The acid-dissociation constant for acetic acid is 1.8×10−5. What is the molarity of the solution? * I know to find pH you can take the -log(x)=9.65 and I found that the M is 6.44*10^-5 M, but I'm not sure if this is the molarity they are asking for, or where the Ka comes into play...... show more
    A solution of sodium acetate (NaCH3COO) has a pH of 9.65. The acid-dissociation constant for acetic acid is 1.8×10−5. What is the molarity of the solution? * I know to find pH you can take the -log(x)=9.65 and I found that the M is 6.44*10^-5 M, but I'm not sure if this is the molarity they are asking for, or where the Ka comes into play... Please help, I've been stuck on this problem for days :(
    1 answer · Chemistry · 2 years ago
  • Please help! Frustrating A level Chemistry question that looks easy but isn't. Ionic equilibria?

    I thought this question is simple and I know how to do, but whatever I do I just can't get the answer, yet everyone else can. Appreciate any kind souls for helping me with explaining this question, will definitely give thumbs up and good rating for your answer.
    I thought this question is simple and I know how to do, but whatever I do I just can't get the answer, yet everyone else can. Appreciate any kind souls for helping me with explaining this question, will definitely give thumbs up and good rating for your answer.
    1 answer · Chemistry · 3 years ago
  • Please help with this problem?

    Determine (a) the molality and (b) the percent by mass of urea for a solution prepared by dissolving 6.82 g of urea [(NH2)2CO] in 283 g of water?
    Determine (a) the molality and (b) the percent by mass of urea for a solution prepared by dissolving 6.82 g of urea [(NH2)2CO] in 283 g of water?
    1 answer · Chemistry · 3 years ago
  • Titration question?

    In this question, why are the moles of HCl (2.43x10-2) not timesed by four to find the moles of 4HCl in the equation? the chloride of an element "Z" reacts with water according to the following equation ZCL(4) + 2H(2)O ----- ZO(2) + 4HCL a 1.304g sample of ZCL(4) was added to water. The solid ZO(2) was removed by filtration and the... show more
    In this question, why are the moles of HCl (2.43x10-2) not timesed by four to find the moles of 4HCl in the equation? the chloride of an element "Z" reacts with water according to the following equation ZCL(4) + 2H(2)O ----- ZO(2) + 4HCL a 1.304g sample of ZCL(4) was added to water. The solid ZO(2) was removed by filtration and the resulting solution was made up to 250 cm3 in a volumetric flask. A 25cm3 portion was titrated against a 0.112 mol dm3 solution of sodium hydroxide, of which 21.7cm3 were titrated to reach the end point.
    1 answer · Chemistry · 3 years ago
  • Chemistry, please help?

    my text book says that CO3, NO3, SO4 ions stay in solution and oxygen is given off and it says OH ions stay in solution - what does that mean EXACT EXTRACT: CO3 ions NO3 ions SO4 ions NONE of the above ions are discharged we got O2 instead. OH ion from H2O Chloride Bromide Iodide HALOGENS are discharged (when concentrated) and OH ions... show more
    my text book says that CO3, NO3, SO4 ions stay in solution and oxygen is given off and it says OH ions stay in solution - what does that mean EXACT EXTRACT: CO3 ions NO3 ions SO4 ions NONE of the above ions are discharged we got O2 instead. OH ion from H2O Chloride Bromide Iodide HALOGENS are discharged (when concentrated) and OH ions stay in solution I am referring to the electrochemical series
    1 answer · Chemistry · 9 years ago
  • Calculate the pH of a solution that is .410 M in HOCL and .050 M in NaCL?

    calculate the pH of a solution that is .410 M in HOCL and .050 M in NaCL [Ka(HOCL)=3.2 x10^-8] Please explain step by step Thanks calculate the pH of a solution that is .410 M in HOCL and .050 M in NaOCL Here is the correction
    calculate the pH of a solution that is .410 M in HOCL and .050 M in NaCL [Ka(HOCL)=3.2 x10^-8] Please explain step by step Thanks calculate the pH of a solution that is .410 M in HOCL and .050 M in NaOCL Here is the correction
    2 answers · Chemistry · 6 years ago
  • Determine pH of solutions?

    Determine the pH of each of the following solutions. a) 3.20 mL of 1.40 M HCl diluted to .600 L b) A mixture formed by adding 58.0 mL of 2.5 *10^-2 M HCl to 160 mL of 1.5 * 10^-2 M HI
    Determine the pH of each of the following solutions. a) 3.20 mL of 1.40 M HCl diluted to .600 L b) A mixture formed by adding 58.0 mL of 2.5 *10^-2 M HCl to 160 mL of 1.5 * 10^-2 M HI
    1 answer · Chemistry · 6 years ago
  • How do you name this compound?

    If you have an alkane that has been hydrohalogenated with iodine, and contains a methyl group, how would you go about naming it? By the way, I'm not making this problem up... it's just a crazy Lon-cappa problem.
    If you have an alkane that has been hydrohalogenated with iodine, and contains a methyl group, how would you go about naming it? By the way, I'm not making this problem up... it's just a crazy Lon-cappa problem.
    2 answers · Chemistry · 6 years ago
  • A sphere 27 cm in diameter contains an ideal gas at 1.6 atm and 16◦C. As the sphereis heated to 150◦C, gas is?

    1). A sphere 27 cm in diameter contains an ideal gas at 1.6 atm and 16◦C. As the sphere is heated to 150◦C, gas is allowed to escape. The valve is closed and the sphere is placed in an ice-water bath. How many moles of gas escape from the sphere as it warms? Answer in units of mol. 2). What is the pressure in the sphere when it is in the... show more
    1). A sphere 27 cm in diameter contains an ideal gas at 1.6 atm and 16◦C. As the sphere is heated to 150◦C, gas is allowed to escape. The valve is closed and the sphere is placed in an ice-water bath. How many moles of gas escape from the sphere as it warms? Answer in units of mol. 2). What is the pressure in the sphere when it is in the ice water? Answer in units of Pa.
    1 answer · Physics · 6 years ago
  • Chemistry questions on finding OH, pH, and pKa?

    I have worked numerous questions like these and for some reason I am stumped on these!! Calculate [OH-] for a solution formed by adding 6.00 mL of 0.180 M KOH to 10.0 mL of 8.3×10−2 M Ca(OH)2. Calculate [OH-] for a solution formed by adding 6.00 mL of 0.180 M KOH to 10.0 mL of 8.3×10−2 M Ca(OH)2. This is also confusing me - I think I had... show more
    I have worked numerous questions like these and for some reason I am stumped on these!! Calculate [OH-] for a solution formed by adding 6.00 mL of 0.180 M KOH to 10.0 mL of 8.3×10−2 M Ca(OH)2. Calculate [OH-] for a solution formed by adding 6.00 mL of 0.180 M KOH to 10.0 mL of 8.3×10−2 M Ca(OH)2. This is also confusing me - I think I had used the wrong equation: A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. The company is interested in the drug's Ka value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries. To find the pKa of X-281, you prepare a 0.088 M test solution of X-281. The pH of the solution is determined to be 2.40. What is the pKa of X-281? I came up with 4.94 and it was wrong! Any help greatly appreciated!!!
    3 answers · Chemistry · 7 years ago
  • What is the mass percent for a compound?

    Hey, I need a little help on my Chemistry study guide, I've been looking all night for this answer and I still have yet to find it. If anyone could help, that would be greatly appreciated! Thank you! Sincerly, Bacon Face (Brother's account) I really need to know what a compound is so that I could figure out what the compound formula... show more
    Hey, I need a little help on my Chemistry study guide, I've been looking all night for this answer and I still have yet to find it. If anyone could help, that would be greatly appreciated! Thank you! Sincerly, Bacon Face (Brother's account) I really need to know what a compound is so that I could figure out what the compound formula is. My teacher didn't explain it in class. So I just need help.
    2 answers · Chemistry · 7 years ago
  • What is the product of this chemical equation, CuSO4 + NH4OH---->?

    Please help cause idk how to derive this...
    Please help cause idk how to derive this...
    3 answers · Chemistry · 8 years ago
  • Calculate Ka during titration?

    50 mL of .1558M HA (a weak acid) is titrated with .2211M NaOH. The equivalence point occurs when 35.23 mL NaOH has been added. When 20 mL NaOH has been added, the pH is 4.23. Find Ka for the acid.
    50 mL of .1558M HA (a weak acid) is titrated with .2211M NaOH. The equivalence point occurs when 35.23 mL NaOH has been added. When 20 mL NaOH has been added, the pH is 4.23. Find Ka for the acid.
    3 answers · Chemistry · 7 years ago
  • Hello, is there a software or Office add-on that allows you to make chemical and mathematical expressions?

    easily? I already have chemistry formatter for MS Office but that's very limited. Is there a software where you can draw easily something like this: http://www.1-formula.com/upl/Image/image... and then included in an Office document? Thank you very much!
    easily? I already have chemistry formatter for MS Office but that's very limited. Is there a software where you can draw easily something like this: http://www.1-formula.com/upl/Image/image... and then included in an Office document? Thank you very much!
    1 answer · Chemistry · 7 years ago
  • Multiple choice:How many grams must be added to make a buffer solution of pH?

    How many grams of NaNO2 would have to be added to 1.00 L of 0.200 M HNO2 (pKa = 3.15) to prepare a solution of a buffer with a pH = 3.45? a) 18.4 g NaNO2 b) 0.400 g NaNO2 c) 6.9 g NaNO2 d) 27.6 g NaNO2
    How many grams of NaNO2 would have to be added to 1.00 L of 0.200 M HNO2 (pKa = 3.15) to prepare a solution of a buffer with a pH = 3.45? a) 18.4 g NaNO2 b) 0.400 g NaNO2 c) 6.9 g NaNO2 d) 27.6 g NaNO2
    2 answers · Chemistry · 7 years ago
  • Please Help How Do I Solve Adding Strong Acid to Buffered Solution?

    How do i do this problem i keep getting 7.28 for a Calculate the pH after 0.010 mol HCl is added to 288.6mL of each solution. a. ______________ 0.050 M NH3 / 0.15 M NH4Cl b. ______________ 0.50 M NH3 / 1.50 M NH4Cl My answer key shows the answer for a) is 8.17 b) is 8.73 I can't find a clear explanation that shows me... show more
    How do i do this problem i keep getting 7.28 for a Calculate the pH after 0.010 mol HCl is added to 288.6mL of each solution. a. ______________ 0.050 M NH3 / 0.15 M NH4Cl b. ______________ 0.50 M NH3 / 1.50 M NH4Cl My answer key shows the answer for a) is 8.17 b) is 8.73 I can't find a clear explanation that shows me how to do this Please show your work because I think I messed up on a step or something. Thanks
    1 answer · Chemistry · 7 years ago