Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393600681
Author: Gilbert
Publisher: W. W. Norton & Company
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Calculate the pH of 100.0 mL of a buffer that is 0.0800 M NH4Cl and 0.135 M NH3 before and after the addition of 1.00 mL of 5.40 M HNO3.
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Chapter 15 Solutions
Chemistry: An Atoms-Focused Approach
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- Marble is almost pure CaCO3. Acid rain has a devastating effect on marble statuary left outdoors. Assume that the reaction which occurs is CoCO3(s)+ H+(aq)Ca2+(aq)+HCO3(aq) Neglecting all other competing equilibria and using Tables 15.1 and 13.2, calculate (a) K for the reaction. (b) the molar solubility of CaCO3 in pure water. (c) the molar solubility of CaCO3 in acid rainwater with a pH of 4.00.arrow_forwardWhat volume of 0.200 M HCl must be added to 500.0 mL of 0.250 M NH3 to have a buffer with a pH of 9.00?arrow_forwardCalculate the pH of 0.500 L of a buffer solution composed of 0.50 M formic acid (HCO2H) and 0.70 M sodium formate (NaHCO2) before and after adding 10.0 mL of 1.0 M HCl.arrow_forward
- Which of the following would form a buffer if added to 250.0 mL of 0.150 M SnF2? (a) 0.100 mol of HCl (b) 0.060 mol of HCI (c) 0.040 mol of HCl (d) 0.040 mol of NaOH (e) 0.040 mol of HFarrow_forwardA buffer is prepared by mixing 525 mL of 0.50 M formic acid, HCHO2, and 475 mL of 0.50 M sodium formate, NaCHO2. Calculate the pH. What would be the pH of 85 mL of the buffer to which 8.6 mL of 0.15 M hydrochloric acid had been added?arrow_forwardKa for formic acid is 1.7 104 at 25C. A buffer is made by mixing 529 mL of 0.465 M formic acid, HCHO2, and 494 mL of 0.524 M sodium formate, NaCHO2. Calculate the pH of this solution at 25C after 110 mL of 0.152 M HCl has been added to this buffer.arrow_forward
- Which of the following would form a buffer if added to 250.0 mL of 0.150 M SnF2? (a) 0.100 mol of HCl (b) 0.060 mol of HCl (c) 0.040 mol of HCl (d) 0.040 mol of NaOH (e) 0.040 mol ofarrow_forwardA buffer solution is prepared by dissolving 1.50 g each of benzoic acid, C6H5CO2H, and sodium benzoate, NaC6H5CO2, in 150.0 mL of solution. (a) What is the pH of this buffer solution? (b) Which buffer component must be added, and in what quantity, to change the pH to 4.00? (c) What quantity of 2.0 M NaOH or 2.0 M HCl must be added to the buffer to change the pH to 4.00?arrow_forwardYou want to make a buffer with a pH of 10.00 from NH4+/NH3. (a) What must the [ NH4+ ]/[ NH3 ]ratio be? (b) How many moles of NH4Cl must be added to 465 mL of an aqueous solution of 1.24 M NH3 to give this pH? (c) How many milliliters of 0.236 M NH3 must be added to 2.08 g of NH4Cl to give this pH? (d) What volume of 0.499 M NH3 must be added to 395 mL, of 0.109 M NH4Cl to give this pH?arrow_forward
- A buffer is made up of 0.300 L each of 0.500 M KH2PO4 and 0.317 M K2HPO4. Assuming that volumes are additive, calculate (a) the pH of the buffer. (b) the pH of the buffer after the addition of 0.0500 mol of HCl to 0.600 L of buffer. (c) the pH of the buffer after the addition of 0.0500 mol of NaOH to 0.600 L of buffer.arrow_forwardHow many grams of NaF must be added to 70.00 mL of 0.150 M HNO3 to obtain a buffer with a pH of 4.68?arrow_forwardFind the pH of the solution obtained when 25 mL of 0.065 M benzylamine, C7H7NH2, is titrated to the equivalence point with 0.050 M hydrochloric acid. Kb for benzylamine is 4.7 1010.arrow_forward
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