# TO DETERMINE THE SOLUBILITY OF BARIUM CHLORIDE IN WATER (GRAVIMETRIC METHOD OF ESTIMATION)

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## APPARATUS REQUIRED:

Conical flask / Beaker, Weighing balance, Evaporating dish,Pipette.

## CHEMICAL REQUIRED:

Barium chloride, Water

## THEORY:

Solubility is often expressed as the number of milliliters of solvent needed to dissolve 1 gram of solute to make a saturated solution. Solubility refers to the ability of a substance to dissolve in a given amount of solvent to form a saturated solution for solids, solubility is often described in terms of how much of the solid can dissolve in a specific volume of solvent, such as water Solubility serves as a measure of how much of a substance can dissolve in a specific amount of solvent to form a saturated solution, providing valuable information about the substance’s behavior in solution.

## PROCEDURE:

An increasing amount of barium chloride was added to about 50 ml water in a conical flask/beaker with shaking/stirring until the solution was saturated and a part of solid was left undissolved (around 20gm barium chloride was required). The solution was filtered and 10ml of the filtrate was pipetted out into a tared (preweighed) evaporating dish. The dish containing 10 ml filtrate was weighed. The filtrate was evaporated to dryness & further dried at about 100°C in an oven. Then it was cooled and weighed. Drying was continued till a constant weight was obtained.

## OBSERVATION:

Room temperature:  °C

i) Weight of empty dish (W₁) = 85.01gm

ii) Weight of dish + 10ml solution (W2) = 97.55gm

iii) Weight of dish + dry solution in gm/powder remaining after drying (W3) = 88.44gm

## CALCULATION:

weight of solute in 10 ml solution = W3-W1

= 88.44-85.01

= 3.43gm

weight of solvent in 10 ml solution = W2-W3

= 97.55-88.44

= 9.11gm

volume of solvent in ml = weight of solvent/density of solvent (water)

= 9.11/1

= 9.11 ml

Solubility is the parts of solvent required for 1 part of solute.

3.43gm of solute requires 9.11 ml of water

1gm of solute requires 9.71/3.43 ml of water

i.e. 2.65 ml of water

## RESULT

The solubility of barium chloride in water at room tempeture  is 1 in 2.65ml. Hence, the given sample of barium chloride is freely soluble in water.