SUPPL INSTR FOR CH 302 (GE 206E) - answerstoPracticeproblemspolyprotic

# SUPPL INSTR FOR CH 302 (GE 206E) - answerstoPracticeproblemspolyprotic

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Practice Problems: Refer to Table 10.9 in the text for needed K a values. 1. Write the stepwise proton transfer equilibria for the deprotonation of H 3 AsO 4 . 2. Calculate the pH of 0.15 M H 2 SO 4 (aq) at 25° C. 3. Estimate the pH of (a) 0.15 M NaHSO 3 (aq) and (b) 0.050 M NaHSO 3 (aq). 4. State which species (H 2 A, HA - , or A 2 - ) you expect to be the form present in highest concentration in aqueous solution at pH = 6.50 for the acids (a) phosphorous acid, (b) oxalic acid, and (c) hydrosulfuric acid 5. Calculate the pH of (a) 6.55 x 10 -7 M HClO 4 (aq) and (b) 9.78 x 10 -8 M KOH. 6. Calculate the concentrations of H 2 CO 3 , HCO 3 - , CO 3 2- , H 3 O + , and OH - present in 0.0456 M H 2 CO 3 (aq). 7. Calculate the concentrations of H 2 CO 3 , HCO 3 - , CO 3 2- , H 3 O + , and OH - present in 0.0456 M Na 2 CO 3 (aq). 8. Calculate the pH of 0.20 M H 2 S, ignoring the second deprotonation only if justified. 9.

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## This note was uploaded on 09/28/2009 for the course GE 206E taught by Professor staff during the Spring '09 term at University of Texas.

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SUPPL INSTR FOR CH 302 (GE 206E) - answerstoPracticeproblemspolyprotic

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