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Goryan [66]
3 years ago
10

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

Chemistry
1 answer:
erastova [34]3 years ago
5 0

Explanation:

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

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

Given the disociation of the salt in water:

KBr \longrightarrow K^+ + Br^-

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

The Kps:

Kps=[K^+][Br^-]

[KBr]=(Kps)^{1/2}

[KBr] are <u>moles of the salt per litre of water</u>

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

To calculate the mass:

m=[KBr]*M*0.1 litre

where M is the molecular weight of the salt.

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