Using Solution Molality

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Using Solution Molality By Gabriel Hannawi

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Using Solution Molality. By Gabriel Hannawi. How many grams of potassium iodide must be dissolved in 500.0g of water to produce a 0.060 molal KI solution?. Known: Mass of water-500.0g Solution concentration-0.060m Molar mass KI-166.0g/mol Unknown: Mass of solute- xg KI. - PowerPoint PPT Presentation

Transcript of Using Solution Molality

Page 1: Using Solution Molality

Using Solution Molality

By Gabriel Hannawi

Page 2: Using Solution Molality

How many grams of potassium iodide must be dissolved in 500.0g of water to produce a 0.060 molal KI solution?

Known:• Mass of water-500.0g• Solution concentration-0.060m• Molar mass KI-166.0g/mol

Unknown:• Mass of solute-xg KI

Page 3: Using Solution Molality

Known:Mass of water-500.0gSolution concentration-0.060mMolar mass KI-166.0g/molUnknown:Mass of solute-xg KI

gKI=.5 kg H20x(0.060 mol KI/1.0kg H20)x(166.0g KI/1 mol KI)=5.0 g KI

Molality=moles of solute/kilograms of solvent

Page 4: Using Solution Molality

Practice Problems

• How many grams of sodium fluoride are needed to prepare 0.4m NaF solution that contains 750 g of water?

• Calculate the molality of a solution prepared by dissolving 10.0g NaCl in 600g of water.


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