Question

How will you prepare 100 times dilute solution from 1 ml concentrated sulphuric acid solution ? What precaution would you suggest and why ?

Answer 1

In order to dilute an acid, first of all you have to decide the concentration of desired solution (C2) and of course you have to know the concentration of the original acid solution (C1) that you wanna dilute .
In addition you have to decide the volume of interest of the diluted solution you gonna get (V2).
Make sure that C1 and C2 are given in the same unit for example both of them in molarity (M).

After you get these values you have to use this formula:

C1.V1=C2.V2 which means:
(solution's concentration) x initial volume = (the diluted solutions' concentration) x final volume

Using this formula you can get the value of V2. In order to know how much water you should add to V1 calculate it by:

=V2-V1 the result is the amount of water which you have to add to V1 to get the diluted solution.

(NOTE : Here , given V1 = 1ml, take C1 = 100 M, then C2 = 1M (since you are diluting 100 times),
hence find V2)

Precaution :-
Add concentrated acid to water slowly with continuous stirring.

Remember, you should never add water to acid. This is because the reaction is exothermic, and the solution may splash out. If you add water to acid, it will be acid which splash onto your skin and being concentrated, it is highly corrosive. Hence, you should always add acid to water slowly.