This question is about vitamin C, C6H8O6.
Vitamin C is a weak monobasic acid with a Ka value of 6.76 × 10–5 mol dm–3.
ii) A bottle of vitamin C supplements contains tablets, each containing 500 mg of vitamin C.
A student dissolves three vitamin C tablets in water and makes up the solution to a volume of 250.0cm3.
Calculate the pH of the solution.
Give your answer to two decimal places.
—- I get how to do most of it except in the first part the markscheme multiplied by 3 to find moles of vitamin c which i dont get