pH and pOH Worksheet - Answer Key
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- What is pH?
pH is simply a convenient way to describe the acidic character of a solution.
- How do you solve for pH?
pH = – log [H+]
- What do the following values of pH indicate about sol’n acidity/basicity?
- pH = 7
The solution is neutral.
- pH > 7
The solution is basic (alkaline).
- pH < 7
The solution is acidic.
- What are the rules of significant figures when solving for pH?
On the pH scale, only number after the decimal are considered significant.
- If [H+] = 1.0 x 10-7 M at 25oC, what is the pH?
pH = 7.00
- What is pOH?
pOH is simply a convenient way to describe the basic character of a solution.
- How do you solve for pOH?
pOH = – log [–OH]
- How do pH and pOH relate?
pH + pOH = 14
- What do the following values of pOH indicate about sol’n acidity/basicity?
- pOH = 7
The solution is neutral.
- pOH > 7
The solution is acidic.
- pOH < 7
The solution is basic.
- Calculate the pH for a 1.08M sol’n of HNO3.
pH = -log (1.08) = -0.333
- Calculate the pH for a 1.00 M sol’n of HF. (Ka = 7.2 x 10-4)
pH = 1.569
- A 10.0 mL sample of HCl has a pH = 2.000. What volume of water must be added to change pH to 4.000?
990 mL water - Calculate the pH of a 5.0 X 10-4 M NaOH sol’n.
pH = 10.70
- Calculate the mass of HONH2 required to dissolve in enough water to make 250.0 mL of sol’n having a pH = 10.00 (Kb = 1.1 x 10-8)
7.50 g of HONH2 required
- The pH of a 1.00 x 10-2 M solution of HOCN is 2.77 at 25oC. Calculate Ka of HOCN from this result.
Ka = 3.5 x 10–4
- Calculate the pH of a 0.30M C2H5NH2 solution. (Kb = 5.6 x 10-4)
pH = 12.11