concentrated sulphuric acid is 18 M H2SO4-----cm3 of this acid is needed to produce 250 cm3 of 0.1 M H2SO4
Answers
Answer:
THEORY :-
To prepare 250 ml of 2M H2SO4 from 18M H2SO4, the volume of concentrated acid required can be calculated by applying molarity equation
M1V1 = M2V2
where, M1 = Molarity of concentrated acid = 18M
V1 = Volume of concentrated acid required = ?
M2 = Molarity of dilute acid to be prepared = 2M
V2 = Volume of dilute acid to be prepared = 250 ml
18 x V1 = 2 x 250
V1=2×25018=27.8ml
Therefore, 27.8 ml of concentrated sulphuric acid should be taken and diluted with water to get 250 ml of 2M H2SO4.
APPARATUS :-
Measuring cylinder, 250 ml measuring flask, beakers and glass rod.
PROCEDURE :-
1.Calculate the volume of 18M H2SO4 required for preparing 250 ml of 5N H2SO4.
2. With the help of a measuring cylinder, take about 100 ml of distilled water in a 400 ml beaker. (This volume of water is slightly less than the volume of water which will be required).
3. Take 27.8 ml of given concentrated H2SO4 in a measuring cylinder. Add it slowly and carefully, with stirring with a glass rod, to the water taken in the beaker. Cool the beaker under tap water from time to time.
4. After all the acid has been added, transfer the solution from the beaker to a 250 ml measuring flask. Add more of water so that the total volume becomes 250 ml.
5. Stopper the measuring flask and shake the solution well to make it uniform. Label it as 2M H2SO4.
Explanation:
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