Can anyone tell me if I am right on these?
Calculate the amount of solute needed to make each of the solutions
225g of 10% (m/m) K2CO3 solution
Answer: 22.5g K2CO3
0.50kg of 18% (m/m) KOH solution
Answer: 90g KOH
To calculate the amount of solute needed to make each of the solutions, we can use the formula:
Mass of Solute = Percentage of Solute (m/m) x Mass of Solution
For the first question, we have:
Mass of Solution = 225g
Percentage of K2CO3 = 10%
Using the formula, we can calculate the mass of solute:
Mass of Solute = 10% x 225g = 0.1 x 225g = 22.5g
So, you are correct in your answer. The amount of solute needed to make a 225g 10% (m/m) K2CO3 solution is 22.5g of K2CO3.
For the second question, we have:
Mass of Solution = 0.50kg = 500g
Percentage of KOH = 18%
Using the formula, we can calculate the mass of solute:
Mass of Solute = 18% x 500g = 0.18 x 500g = 90g
So, you are also correct in your answer. The amount of solute needed to make a 0.50kg 18% (m/m) KOH solution is 90g of KOH.