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WS 08 - Key

# WS 08 - Key - a pH = 4.62 b pH = 10.84 c pH = 5.3 5 What is...

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Name: _____________________________ Quiz Section:_______ CHEM 120A – Autumn 2011 Worksheet #8 1. In each of the following equations, identify the acid, base, the conjugate acid and conjugate base: a. HNO 2 (aq) + H 2 O(l) NO 2 - (aq) + H 3 O + (aq) b. H 2 O(l) + H 2 CO 3 (aq) H 3 O + (aq) + HCO 3 - (aq) c. CO 3 2- (aq) + H 2 O(l) OH - (aq) + HCO 3 - (aq) 2. Predict whether aqueous solutions of each of the following salts are acidic, neutral or basic: a. Na 2 CO 3 b. KCN c. NH 4 NO 3 d. MgSO 4 3. Identify each of the following solutions as neutral, acidic or basic at 25°C: a. [H 3 O + ] = 4.5 x 10 -11 M b. [OH - ] = 5.0 x 10 -10 M c. [OH - ] = 1.0 x 10 -7 M d. [H 3 O + ] = 1.5 x 10 -2 M 4. Calculate [H 3 O + ] and [OH - ] for each solution at 25°C. Identify each solution as neutral, acidic or basic

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Unformatted text preview: a. pH = 4.62 b. pH = 10.84 c. pH = 5.3 5. What is the pH of a solution prepared by dissolving 0.50 g of Ca(OH) 2 in water to make 525 mL of solution? 6. The neutralization of a 40.0 mL sample of H 2 SO 4 of unknown concentration required 33.2 mL of a 0.0420 M NaOH standard solution. Calculate the concentration of the acid. 7. What is the pH of a solution consisting of 0.0050 M acetic acid and 0.0080M sodium acetate? The K a for acetic acid is 1.8 x 10-5 . 8. Complete and balance the following: a. HNO 3 (aq) + Al(OH) 3 (s) b b. Ca(s) + HCl(aq) b c. KHCO 3 (s) + HNO 3 (aq) b...
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WS 08 - Key - a pH = 4.62 b pH = 10.84 c pH = 5.3 5 What is...

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