Which of thefollowing solutions have same concentration.a) 20g Na OH in 200 mL of solutionb) 0.5mol of KCl in 200mL of solution.c) 40g of NaOH in 100mL of solution.
Question
Which of thefollowing solutions have same concentration.a) 20g Na OH in 200 mL of solutionb) 0.5mol of KCl in 200mL of solution.c) 40g of NaOH in 100mL of solution.
Solution
To compare the concentrations of these solutions, we need to calculate the molarity of each. Molarity (M) is defined as the number of moles of solute per liter of solution.
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For solution a) 20g NaOH in 200 mL of solution:
The molar mass of NaOH is approximately 40g/mol. So, 20g of NaOH is 0.5 mol. The volume of the solution is 200 mL, which is 0.2 L. Therefore, the molarity of this solution is 0.5 mol / 0.2 L = 2.5 M.
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For solution b) 0.5 mol of KCl in 200 mL of solution:
The volume of the solution is 200 mL, which is 0.2 L. Therefore, the molarity of this solution is 0.5 mol / 0.2 L = 2.5 M.
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For solution c) 40g of NaOH in 100 mL of solution:
The molar mass of NaOH is approximately 40g/mol. So, 40g of NaOH is 1 mol. The volume of the solution is 100 mL, which is 0.1 L. Therefore, the molarity of this solution is 1 mol / 0.1 L = 10 M.
So, solutions a) and b) have the same concentration of 2.5 M, while solution c) has a higher concentration of 10 M.
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