Question

in 90g of 20% of aqueous Salt solutions 10g more water is added then find the final concentration of the solution

Answer 1

Answer:

Percent by mass =

mass of glucose

total mass of solution

×

100

%

=

26.5

g

500

g

× 100 % = 5.30 %

PERCENT BY VOLUME

Percent by volume (v/v) is the volume of solute divided by the total volume of the solution, multiplied by 100 %.

Percent by volume =

volume of solute

total volume of solution

× 100 %

Example

How would you prepare 250 mL of 70 % (v/v) of rubbing alcohol

Solution

70 % =

volume of rubbing alcohol

total volume of solution

×

100

%

× 100 %

So

Volume of rubbing alcohol = volume of solution ×

70 %

100 %

= 250 mL ×

70

100

= 175 mL

You would add enough water to 175 mL of rubbing alcohol to make a total of 250 mL of solution.

Explanation:

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