Answer to Question #160784 in Biochemistry for john doley

Question #160784

How many grams of KCl (74.6 mw) would you weigh to make 200 ml of 4% (w/v) solution?


1
Expert's answer
2021-02-03T08:30:07-0500

w/v solution means the weight/mass of solute dissolved in 100ml of solvent.


For calculating the percentage (%w/v) :


(Mass of solute÷ volume of solvent) × 100


So, 4% w/v solution means that 4g of KCl is dissolved in 100 ml of water.


To make a 200ml of 4% w/v solution, 8g of KCl is required to be dissolved in 200ml of solvent.


Proof:


%w/v= (mass of solute÷volume of solution)×100


Given: Mass of solute (KCl) = 8g

Volume of solvent=200ml


Now, put the value


(8÷200)×100= 4% ( the required percentage)


Hence, the answer is 8g. 8g of KCl is required to prepare 200ml of 4% w/v solution.



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