Cooks use baking soda to make cakes light and fluffy. You might have used baking soda yourself. Baking soda is NaHCO3. A 0.1 M solution of baking soda in water has a [H+] of about 4.0 * 10-9. (You may prefer to think of the hydronium ion concentration, [H3O+], as 4.0 * 10-9.) Write the formula for the calculation of pH, and then show each step as you calculate the pH of a 0.1 M solution of baking soda.

Question

Chemistry

Serena Ochoa

11 March, 18:18

Cooks use baking soda to make cakes light and fluffy. You might have used baking soda yourself. Baking soda is NaHCO3. A 0.1 M solution of baking soda in water has a [H+] of about 4.0 * 10-9. (You may prefer to think of the hydronium ion concentration, [H3O+], as 4.0 * 10-9.) Write the formula for the calculation of pH, and then show each step as you calculate the pH of a 0.1 M solution of baking soda.

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Zechariah Clements · Answer 1

PH = - log [H⁺] ←←[log without a specified base means log base 10]

and if you want to use the hydronium ion concentration then use pH = - log [H₃O⁺]

either way the calculation is the same:

They give that a 0.1 M solution of NaHCO₃ has a hydrogen ion concentration of 4.0 x 10^ (-9)

so pH = - log (4.0 x 10^ (-9))

pH = 8.4