Chem 1020 pH Calculations Worksheet
Fill in the empty blanks, and tell whether the solution will be acidic, basic, or neutral.
*Perform the starred problems without a calculator.
Fun fact: for a pH or pOH value, the only sig figs are the numbers to the right of the
decimal point. So, pH = 4.73 has 2 sig figs. Why? The digits to the left of the decimal
correspond with the power of 10, and thus have no uncertainty. All of the values in this
table have 3 sig figs!
[H
3
O
+
] [OH
−
]
pH pOH Acidic/Basic/Neutral
1.
2.35 × 10
−3
4.26 × 10
−12
2.629 11.371 acidic
2.
2.03 × 10
−7
4.93 × 10
−8
6.693 7.307 acidic
3.
4.79 × 10
−9
2.09 × 10
−6
8.320 5.680 basic
4.
1.86 × 10
−4
5.37 × 10
−11
3.730 10.270 acidic
5.
3.72 × 10
−10
2.69 × 10
−5
9.429 4.571 basic
6.
1.00 × 10
−7
*1.00 × 10
−7
7.000 7.000 neutral
7.
2.63 × 10
−3
3.80 × 10
−12
2.580 11.420 acidic
8.
1.82 × 10
−9
5.50 × 10
−6
8.740 5.260 basic
9.
*1.00 × 10
−3
1.00 × 10
−11
3.000 11.000 acidic
10.
2.34 × 10
−13
4.27 × 10
−2
12.630 1.370 basic
11.
1.00 × 10
−8
1.00 × 10
−6
*8.000 6.000 basic
12.
1.10 × 10
−12
9.12 × 10
−3
11.960 2.040 basic
