Question

Question 2. The concentration of Acetic Acid (AA) in 5%v/v white vinegar is 0.875 M. Using dimensional analysis and the terms below, assemble the correct formula to calculate the concentration of Acetic Acid (AA) in white vinegar.

Terms :

1.05 𝑔 𝐴𝐴 /1 𝑚𝐿 𝐴𝐴

5 𝑚𝐿 𝐴𝐴 / 100mL vinegar

60.0 𝑔 𝐴𝐴 /1 𝑚𝑜𝑙 𝐴𝐴

1000 𝑚𝐿 / 1 𝐿

Remember that: 𝐶𝑜𝑛𝑐𝑒𝑛𝑡𝑟𝑎𝑡𝑖𝑜𝑛 𝑜𝑓 𝑉𝑖𝑛𝑒𝑔𝑎𝑟 = 𝑚𝑜𝑙𝑒𝑠 𝐴𝐴 𝐿 𝑣𝑖𝑛𝑒𝑔𝑎𝑟

Answer 1

%V/V=5% (which means 5ml AA/100ml vinegar)

Concentration of vinegar= 0.875M

Concentration of Acetic acid= ?

Since the vinegar is only 5% acetic acid,

Concentration of Acetic acid= 5% of concentration of vinegar

Concentration of Acetic acid= 5ml/100ml x 0.0875M

= 0.04375M (This concentration is absolutely 5% AA)