Ask Question
11 January, 20:37

A solution of NaOH has a concentration of 25.00% by mass. What mass of NaOH is present in 0.250 g of this solution? Use the periodic table in the toolbar if needed.

0.0625

g

What mass of NaOH must be added to the solution to increase the concentration to 30.00% by mass?

g

+4
Answers (2)
  1. 11 January, 20:55
    0
    1) 0.0625 g.

    2) 0.0125 g.

    Explanation:

    1) A solution of NaOH has a concentration of 25.00% by mass. What mass of NaOH is present in 0.250 g of this solution?

    We can use the relation:

    mass% of NaOH = [ (mass of NaOH) / (mass of solution) ] x 100.

    mass% of NaOH = 25.0%, mass of NaOH = ? g, mass of solution = 0.250 g.

    ∴ mass of NaOH = (mass% of NaOH) (mass of solution) / 100 = (25.0%) (0.250 g) / 100 = 0.0625 g.

    2) What mass of NaOH must be added to the solution to increase the concentration to 30.00% by mass?

    We can use the relation:

    mass% of NaOH = [ (mass of NaOH) / (mass of solution) ] x 100.

    mass% of NaOH = 30.0%, mass of NaOH = ? g, mass of solution = 0.250 g.

    ∴ mass of NaOH = (mass% of NaOH) (mass of solution) / 100 = (30.0%) (0.250 g) / 100 = 0.075 g.

    ∴ The mass of NaOH should be added = 0.075 - 0.0625 = 0.0125 g.
  2. 11 January, 21:05
    0
    1) 0.0625 g.

    2) 0.0125 g.

    3) 80.0 g

    Explanation:

    edge
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “A solution of NaOH has a concentration of 25.00% by mass. What mass of NaOH is present in 0.250 g of this solution? Use the periodic table ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers