Question

One cup of fresh orange juice contains 124 mg of ascorbic acid (vitamin c, c6h8o6). given that one cup = 236.6 ml, calculate the molarity of vitamin c in organic juice.

Answer 1

Answer : The molarity of vitamin c in organic juice is,
`2.97* 10^(-3)mole/L`

Solution : Given,

Mass of ascorbic acid (solute) = 124 mg = 0.124 g
`(1mg=0.001g)`

Volume of juice = 236.6 ml

Molar mass of ascorbic acid = 176.12 g/mole

Formula used :

`Molarity=\frac{\text{Moles of solute}* 1000}{\text{Molar mass of solute}* \text{volume of solution}}`

Now put all the given values in this formula, we get the molarity of vitamin c in organic juice.

`Molarity=(0.124g* 1000)/(176.12g/mole* 236.6ml)=2.97* 10^(-3)mole/L`

Therefore, the molarity of vitamin c in organic juice is,
`2.97* 10^(-3)mole/L`