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311 pH problems

# 311 pH problems - Biochemistry 311 Problem Set pH and...

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Biochemistry 311 Problem Set: pH and Buffer 1. Calculate the [H + ] of a) blood plasma, pH 7.4, b) cow's milk, pH 6.6, c) gastric juice, pH 1.5, d) tomato juice, pH 4.3, and e) cola drink, pH 2.8. 2. The pK a values of acetic acid and trichloroacetic acid are 4.7 and 0.7, respectively. Which is the stronger acid and what are the corresponding dissociation constants? 3. What is the [OH - ] of 0.1 M HCl solution? 4. The K b for ammonia (NH 3 ) is 1.8 x 10 -5 mole liter -l . What is its K a value? 5. Calculate the pH of a 0.001 M solution of dichloroacetic acid, K a 5.0 x 10 -2 . 6. The pH of 0.1 M HCl is 1.0, of 0.1 M acetic acid is 2.8. What volume of 0.1 N NaOH would be required to titrate 10 mL aliquots of each acid solution to their respective end points? 7. Which is stronger, a 1/20 M H 2 SO 4 solution or a 1/10 M acetic acid solution? Explain. (The first proton dissociates from sulfuric acid completely, the second pK a is 1.9; the pK a of acetic acid is 4.7.) 8. Make up l liter of 0.0l M sodium acetate buffer at pH 4.5. The pK a of acetic acid is 4.7. Calculate the grams of anhydrous sodium acetate (m.w. 82) and number of milliliters of glacial acetic acid

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