What is the hydroxide ion concentration of a lye solution that has a pH of 9.20?

ID: 546870 • Letter: W

Question

6.31 × 10-10 M

Which solution is most acidic (that is, which one has the lowest pH)?

Determine the pOH of a 0.227 M C5H5N solution at 25°C. The Kb of C5H5N is 1.7 × 10-9.

9.20 M 4.80 M 1.58 × 10-5 M

6.31 × 10-10 M

Which solution is most acidic (that is, which one has the lowest pH)?

0.80 M HF 0.80 M HCl 1.6 M HF

Determine the pOH of a 0.227 M C5H5N solution at 25°C. The Kb of C5H5N is 1.7 × 10-9.

4.59 9.29 9.41 4.71 10.14

Ans 1 : 1.58 x 10-5 M

pH is defined as the negative logarithm of hydrogen ion concentration.

pOH = 14 - pH

pOH = 14 - 9.2

pOH = 4.8

pOH = -log [OH-]

4.8 = -log [OH-]

[OH-] = 1.58 x 10-5 M

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