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| From:  Albert1145 (Original Message) | Sent: 9/22/2008 7:53 AM |
Hi Steve, I've been doing a lot of acid and base problems lately. They seem pretty easy but I have two question that I don't get:
A buffer solution is prepared by taking 0.400 moles of acetic acid (pKa = 4.74) and
0.250 moles of sodium acetate in sufficient water to make 1.400 L of solution. What is
the pH of this solution?
(A) 4.46
(B) 4.56
(C) 4.86
(D) 4.96
ANS: (C) but I keep on getting pH 4.53
A mixture is made using 50.0 mL of 0.20 mol L�? HCl(aq) and 150.0 mL of distilled
water. What is the pH of this solution? I think I'm having some trouble with the unit conversion in this one... do I actually need the concentration of distilled water to calculate this question??
(A) 1.30
(B) 13.00
(C) 6.48
(D) 9.16
ANS: (A)
Thank you
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