What will be the concentration of the solution if 15gm of salt is added to 100gm of water approximately :-?

How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?

To make the salt solution of 15% with 15 gm as the mass of the solute, the mass of the solvent must be 85 gm.

`"concentration" = "mass of solute"/"mass of solute + mass of solvent"xx 100`

Mass of solution = mass of solute + mass of solventMass of the solvent = mass of the solution – mass of solvent= 100 – 15 = 85 gm

Therefore, 85 gm of water should be added.

Concept: Matter (Substance)

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How much water should be mixed with 12 mL of alcohol so as to obtain 12 % alcohol solution ?

Volume of solute = 12 mlVolume of solution = volume of solute + volume of solvent    

Volume of solvent = volume of solution – volume of solvent = 100 – 12 = 88 ml

`"Concentration" = "Volume of solute"/"volume of solute + mass of solvent"xx 100`

`12 =12/(12 + x)xx100`

`x=88`

So, 88 ml of water will be added to 12 ml of alcohol in order to prepare a concentration 12%.

Concept: Matter (Substance)

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