0.70 gg of hydrogen chloride (HClHCl) is dissolved in water to make 4.0 LL of solution. What is the pHpH of the resulting hydrochloric acid solution? Express the pH numerically to two decimal places.

The pH of the hydrochloric solution is 2.32

Explanation:

Step 1: Data given

Mass of HCl = 0.70 grams

Volume = 4.0 L

Molar mass of HCl = 36.46 g/mol

Step 2: Calculate moles HCl

Moles HCl = mass HCl / molar mass HCl

Moles HCl = 0.70 grams / 36.46g/mol

Moles HCl = 0.0192 moles

Step 3: Calculate molarity

Molarity HCl = moles HCl / volume

Molarity HCl = 0.0192 moles / 4.0 L

Molarity HCl = 0.0048 M

Step 4: Calculate molarity H+

For 1 mol HCl we have 1 mol H+

Molarity HCl = molarity H+ = 0.0048 M

Step 5: Calculate pH

pH = -log[H+]

pH = -log (0.0048)

pH = 2.32

The pH of the hydrochloric solution is 2.32

there are two significant figures.