Test%203%20Practice%20answers0

Test%203%20Practice%20answers0 - Test 3 Practice Strong...

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Test 3 Practice Strong Acids 1. Solve for the [H 3 O + ] and pH of 0.45 M NaOH. [OH - ] = 0.45 M pOH = -log(0.45) = 0.35 pH = 14 – 0.35 = 13.65 Weak Acids 2. Solve for the pH of 0.23 M HClO with K a = 2.9 * 10 −8 2.9 x 10-8 = x2 / (0.23 – x) x = 8.2 x 10 -5 = [H 3 O + ] pH = -log(8.2 x 10 -5 ) = 4.09 3. Solve for the %diss above (8.2 x 10 -5 / 0.23) x 100 = 0.0356% Buffers 4. Solve for the pH of a buffer that 1.00 L of 0.10 M HNO 2 and 0.10 M NO 2 . The K a of HNO 2 = 7.10 * 10 −4 pH = -log (7.10 x 10-4) + log (0.10/0.10) pH = 3.15 5. Solve for the pH of the above buffer after 1.00 g of NaOH are added . 1.00 g NaOH x (1 mol / 40 g) = 0.025 mol NaOH / 1L = 0.025 M pH = 3.15 + log (0.125 / 0.075) pH = 3.37 6. Solve for the pH of 1.000 L of pure water with 1.00 g of NaOH added. 1.00 g NaOH x (1 mol / 40 g) = 0.025 mol NaOH / 1L = 0.025 M [OH - ] = 0.025 M pOH = 1.60 pH = 14 – 1.60 = 12.4
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Test 3 Practice Neutralization reactions 7. Write a neutralization reaction for HClO with NH 3
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Test%203%20Practice%20answers0 - Test 3 Practice Strong...

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