Question

3. Severely dehydrated patients may be given a "physiological buffered saline" (PBS) solution with a pH of about 7.4 intravenously to restore their fluid balance. Do you think that PBS would contain only sodium chloride in the solution? Justify your answer. 4. Use the dilution equation to calculate the number of milliliters of 3.00 M NaCI needed to make 400.0 mL of a PBS solution with a final sodium chloride concentration of 0.154 M. Show your work. 5. Calculate the molarity of a solution made by dissolving 50.0 grams of KNO, in enough water to make 250.0 mL of solution. Show your work. DATA Mass of NaCI needed for 50.0 mL. of 0.200 M NaCl solution 5944 (Show calculation below.) . 2 x 53.44, 0SL .544 HCL Initial pH pH after Change inftr Change in pl! addition ofpH from addition of from initial acid initial strong base Water 7.91 2.53 -,4 12.02 + 4. 08 10.200 Ml 18.16 | 232 |-5.84 | I,. 80 + 3.6 11.80 NaCI buffer buffer buere 4.72 5 phosphate 0.74 07 4.7 6.92 0 7 QUESTIONS Do chloride or sodium ions have a big effect on pH? What is the evidence that supports your answer? (Hint: Compare the initial pH's of water and 0.200 M NaCL.) 1. The Chloride hes ths bigger ect on pH 2. Is the 0.200 M NaCl solution buffered or not? What is the evidence that supports your answer?

Answer 1

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