Question

Complete the following table by calculating the missing entries and indicating whether the solution is acidic...

Complete the following table by calculating the missing entries and indicating whether the solution is acidic or basic.

[H+] [OH−] pH pOH Acidic or basic?
7.7×10−3M
3.5×10−10M
8.24
5.73

Homework Answers

Answer #1

H+ = 7.7×10−3M

OH- = (10^-14)/(7.7*10^−3) = 1.29870*10^-12

ph = -log(H) = -log(7.7*10^−3 = 2.11350

pOH = 14-pH = 14-2.11350 = 11.8865

this is acidic sicen pH < 7

OH- = 3.5*10^−10

H+ = (10^-14)/(3.5*10^−10) =0.00002857

ph = -log(H) = -log(0.00002857) = 4.54408

pOH = 14-pH = 14-4.54408 = 9.455

3)

pH = 8.24

H+ = 10^-pH = 10^-8.24 = 5.75439

poh = 14-ph = 14-8.24 = 5.76

[OH-] = 10^-poh = 10^-5.76 = 0.0000017378

this is basic

4)

pOH = 5.73

pH = 14-´poh = 14-5.73 = 8.27

H* = 10^-pH = 10^-5.73 = 0.00000186208

OH- = 10^-poh = 10^-8.27 = 5.37*!0^-9

this is basic

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