The molarity of solution containing 75 g of KNO₃ dissolved in 0.350 L of solution is 2.12 M
What is molarity?
Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of KNO₃
- Mass of KNO₃ = 75 g
- Molar mass of KNO₃ = 39 + 14 + (3×16) = 101 g/mol
Mole = mass / molar mass
Mole of KNO₃ = 75 / 101
Mole of KNO₃ = 0.743 mole
How to determine the molarity
- Mole of KNO₃ = 0.743 mole
- Volume = 0.35 L
- Molarity =?
Molarity = mole / Volume
Molarity = 0.743 / 0.35
Molarity = 2.12 M
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