Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Using the molecular weight of Tris base (121.14 g/mol), calculate how much Tris base you need to make 40 mL of a 1.0 M solution.
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Next, calculate how much 6.0 M HCl you expect to have to add to prepare the solution that will have a final pH of 8.0. Use 8.06 for the pKa value of Tris. Proper utilization of the Henderson- Hasselbalch equation should allow you to determine the amount of HCl needed.
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- Describe how you would prepare a 250.0 mL buffer solution that has a pH of 7.40 and has a H2PO4 − concentration of 1.0 M. You only have the following materials available. Materials/Chemicals: 1 L jug of deionized water 250.0 mL volumetric flask 500 mL bottle of 1.0 M H3PO4 500 g bottle of NaH2PO4 500 g bottle of Na2HPO4 500 g bottle of Na3PO4 500 g bottle of HFarrow_forwardI. Consider a 1.00 L of 1.50x10^-3 M hydrocyanic acid (HCN, K=4.9×10^-10) 1. Write the equilibrium expression. 2. Calculate the pH of the solution. 3. If a 9.00x10^-4 mol sodium cyanide, NaCN, is added, what is the pH of the resulting solution? Assume negligible volume change.arrow_forwardA 10.0 mL solution of 0.570 M NH3 is titrated with a 0.190 M HCl solution. Calculate the pH after the following additions of the HCl solution: 0.00 mL, 10.0 mL, 30.0 mL, and 40.0 mL. Round your answer to 3 decimal places. Note: Reference the K of acids at 25 °C and K₁ of bases at 25 °C tables for additional information. b Part 1 of 4 0.00 mL Added, pH = ☐ x10 Part 2 of 4 10.0 mL Added, pH = ☐ ☐ x10 Part 3 of 4 ☑ ✓ Garrow_forward
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