Question

in 90 g of 20 percent(w/w) aqueous salt solution 10g more water is added calculate the final concentration of (w/w)

Answer 1

Answer:

The percent concentration is the volume of solute divided by the total vome of mixture times 100. ... g of sodium hydroxide in enough water to make a total of 225 mL of solution? ... more concentrated;; Adding more solvent - making the solution more dilute; ... How would you prepare 250 mL of 70 % (v/v) of rubbing alcohol.

Explanation:

Answer 2

Given,

Mass of the initial solution is 90 grams.

Concentration (w/w) of the initial solution is 20%.

10 grams of water is added in the initial solution to make the final solution.

To find,

The concentration of the final solution.

Solution,

Mass of the solute in the initial solution :

= 90 × 20/100

= 18 grams

Mass of the final solution :

= 90+10

= 100 grams

So,the final concentration (w/w) will be :

= 100 × Mass of solute/Mass of final solution

= 100 × 18/100

= 18%

Hence,the final concentration (w/w) is 18%.