Vinegar is a chemical used in cooking, cleaning and other common experiences. A 0.1 M solution of vinegar in water has a [H+] of about 1.3 × 10–3. (You may prefer to think of the hydronium ion concentration, [H3O+], as 1.3 × 10–3.)

A. 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 vinegar.

B. Is vinegar an acid or a base? Explain how you know.

a) pH of a 0.1 M vinegar solution is 2.9

b) It is an acid as pH is less than 7

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

As vinegar is  a weak acid, its dissociation is represented as;

   cM              0             0

So dissociation constant will be:

Give c= 0.1 M

Also

Thus pH of a 0.1 M vinegar solution is 2.9

As pH is less than 7,  it is an acid.

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