I do all this work and get points off for significant figures. I\'m really tryin

Question

I do all this work and get points off for significant figures. I'm really trying.

Can someone help me better understand?

CHEM 1451 Lab Week 10 Acid-Base Prelab and Data Jenaifer Ed Dae 323 18 Name Sara Tat Coach's Name PRELAB 1. Consider an aqueous solution in which [H,O'] is 0.014 M at 25°C a. Determine the concentration of OH- in this solution. (10 points) 1.Ox 104- (0.014 LoH LOH-J-1.14x10-13 .-log Co.01 4) 1.85 0 ' O.014 b. Determine the pH value of this solution. (10 points) c. Determine the pOH value of this aqueous solution. (10 points) pH +POH14.DO .85 POH 12.15 1.354 POH9 d. Is this solution acidic, basic or neutral? Explain your answer. (10 points) This Soluhon the Soluhon is less than 7. is acidic. The of

Explanation / Answer

(a)

At 250C,

[H+][OH-] = 1.0 * 10-14

[OH-] = 1.0 * 10-14 / 0.014

[OH-] = 7.1 * 10-13 M

(b)

pH = - Log[H+]

pH = - Log(0.014)

pH = 1.8 M

(c)

pOH = 14 - pH

pOH = 14 - 1.8

pOH = 12.

(d)

Since pH < 7.0, the solution is acidic in nature.

NOTE: Since the given concentration has two significant figures round off all the answers to two significant figures.

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