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3304%20Homework%20#2%20%28chapter%202%29

# 3304%20Homework%20#2%20%28chapter%202%29 - Homework#2 BCHS...

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Homework #2 BCHS 3304 Read FOB chapter #2 Physical properties of water p22- 36. Read and Review Students companion Chapter 2 water p 11-14. Questions 1. How many milligrams of cytochrome c (MW=12,500) would you need to make a 10 ml of a 50 μ M solution? 2. What is the molar concentration of pure glycerol? The density of glycerol is 1.26 g/cm 3 . 2. 13.68 M 3. Write a short one-line definition for the Key Terms on page 37. You are responsible for these terms, but do not turn them in. 4. Problems in FOB, pg 37. 1, 8, 10, 13, 14 and 18. 8. Indicate the ionic species that predominates at pH 4, 8, and 11 for

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a) Ammonia: pH4 NH4+ / pH8 NH4+ / pH 11 NH3 b) Phosphoric acid: pH4 H2PO4- / pH8 HPO4 2- / pH 11 HPO4 2- 10. Calculate the pH of a 1 L solution containing *pH= -log [H+] [H+]= Kw/[OH-] Kw (a constant)= 10^-14 M^2 a) 10 mL of 5 M NaOH (0.010 L)(5 mol*L^-1 NaOH)/(1L)= 0.05 M NaOh or 0.05 OH- [H+]= (10^-14)/(0.05) =2*10^-13 M pH= -log(2*10^-13 M) = 12.7 b) 10 mL of 100 mM glycine and 20 mL of 5 M HCl (0.020 L)(5 mol*L^-1 HCl)/(1L)= 0.1 M HCl = 0.1 M H+ pH= -log(0.1)= 1.0 c) 10 mL of 2 M acetic acid and a 5 g of sodium acetate (MW: 82 g*mol^-1) pH= pK+ log([acetate]/[acetic acid]) [acetate]= (5g)(1 mol/82 g)/(1 L) = 0.061 M
[acetic acid]= (0.01 L)(2 mol)/(1L) = 0.02 M

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