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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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A buffer solution is prepared by mixing 200 mL of 0.500 M HF with 150 mL of 0.250 M KF. What is the pH of the solution after the addition of 5.00 mL of 1.00 M HCl? The Kₐ for HF is 6.8 × 10⁻⁴
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- A titration is performed with KOH and HCl. 0.0100 M HCl is used to titrate a 60.0 ml sample of a 0.0075M solution of KOH. What is the initial pH of the 60.0ml sample of KOH before any HCl is added? What is the pH after 20.0ml of the acid is added? What is the pH at the equivalence point? At the equivalence point, if all of the water is evaporated what mass of KCl is present?arrow_forward4. Consider a buffer made by adding 0.050 mol NaC2H302 and 0.040 mol HC2H3O2 to a liter of water. a) What is the pH of this buffer? b) What is the pH after addition of 0.010 mol NaOH? c) What is the pH after addition of 0.010 mol HCI to the original buffer solution?arrow_forwardA student dissolves 0.0100 mol of an unknown weak base in 100.0 mL water and titrates the solution with 0.100 M HNO3. After 75.0 mL of 0.100 M HNO3 was added, the pH of the resulting solution was 8.15. Calculate the K value for the weak base. Karrow_forward
- How many moles of hydrofluoric acid, HF, must be added to 150 mL of 0.17 M sodium fluoride to give a buffer of pH 3.15? Ignore the volume change due to the addition of hydrofluoric acid. (Ka for HF is 6.8 × 10¬4.) molarrow_forwardA 1.50 L buffer solution consists of 0.280 M propanoic acid and 0.139 M sodium propanoate. Calculate the pH of the solution following the addition of 0.065 mol HCl. Assume that any contribution of the HCl to the volume of the solution is negligible. The Ka of propanoic acid is 1.34×10^−5.arrow_forwardWhat will be the pH of the final solution if 1.50 x 10-2 mol HCl solution is added to the buffer solution (100 mL) that contains 1.0 M HCN and 1.2 M NaCN?arrow_forward
- How many moles of NaOH need to be added to 200.0 mL of a 0.200 M solution of HF to make a buffer with a pH of 3.40? (Ka for HF is 6.8 × 10⁻⁴)arrow_forwardHow many grams of dry NH4Cl need to be added to 2.50 L of a 0.300 M solution of ammonia, NH3 , to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8×10−5 . (Please type answer no write by hend)arrow_forwardWhat quantity in moles of NaOH need to be added to 200.0 mL of a 0.200 M solution of HF to make a buffer with a pH of 3.10? (Ka for HF is 6.8 × 10⁻⁴)arrow_forward
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