# Worksheet: Calculating pH

In this worksheet, we will practice describing the pH scale as a logarithmic measure of acid content and calculating values of pH.

Q1:

The hydronium ion concentration of vinegar is approximately M. What is the corresponding value of the pH?

Q2:

What is the hydronium ion concentration of blood, the pH of which is 7.3 (slightly alkaline)?

• A4.1 M
• B7.3 M
• C M
• D M
• E M

Q3:

Water exposed to air contains carbonic acid, , due to the reaction between carbon dioxide and water, as shown. Air-saturated water has a hydronium ion concentration caused by the dissolved of M, about 20 times larger than that of pure water. What is the pH of the solution at ?

Q4:

What is the pH of stomach acid, which is a solution of with a hydronium ion concentration of M, to 1 decimal place?

Q5:

What is the hydronium ion concentration of a solution with a pH of ?

Q6:

To 2 decimal places, what is the pH of 0.200 M at ? Assume that ionizes completely.

Q7:

Coffee has a pH of about 5.1. Calculate the hydronium ion concentration of coffee at . Express your answer in scientific notation, rounded to 1 decimal places.

• A M
• B M
• C M
• D M
• E M

Q8:

Calculate to 3 significant figures the hydronium ion concentration in a solution with a pH of 6.52. Give your answer to 2 decimal places and in scientific notation.

• A M
• B M
• C M
• D M
• E M

Q9:

Lime juice has a pH of about 2.3. Calculate, to 1 decimal place and in scientific notation, the hydronium ion concentration of lime juice at .

• A M
• B M
• C M
• D M
• E M

Q10:

What is the pH of 3.0 M at ? Assume that ionizes completely.

Q11:

What is the pH of 0.000259 M at ?  Assume that ionizes completely.

• A14.48
• B
• C3.59
• D0.48
• E13.52