How many grams are kbr are needed to make a saturated solution in 100g of water at 30c

Explanation:

To calculate that you need to know the value of the Kps (constant of solubility) at 30°C of KBr in water.

When the product of the concentrations of both ions (Br- and K+) equals the Kps, the solution is saturated.

Given the disociation of the salt in water:

The concentration of both ions are equal (1:1 ratio) and the same as the concentration of KBr added.

The Kps:

[KBr] are moles of the salt per litre of water

Assuming a density of water of 1 g/cm3, 100 g are 0.1 litre

To calculate the mass:

where M is the molecular weight of the salt.

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