# Worksheet: Calculating pH

Q1:

Coffee has a pH of about 5.1. Calculate to 2 significant figures the hydronium ion concentration of coffee at .

• A M
• B M
• C M
• D M
• E M

Q2:

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

Q3:

Calculate to 3 significant figures the hydronium ion concentration in a solution with a pH of 6.52.

• A M
• B M
• C M
• D M
• E M

Q4:

Water exposed to air contains carbonic acid, , due to the reaction between carbon dioxide and water: 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 ?

Q5:

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

Q6:

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

• A10.7
• B10.4
• C3.29
• D3.59
• E4.50

Q7:

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

Q8:

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

Q9:

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

• A 7.3 M
• B M
• C M
• D M
• E M

Q10:

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

Q11:

Lime juice has a pH of about 2.3. Calculate to 2 significant figures the hydronium ion concentration of lime juice at .

• A M
• B M
• C M
• D M
• E M