Warm up - Solutions.

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Warm up - Solutions

Warm up #1 To analyze the alcohol content of a certain wine a chemist needs 1000 ml of an aqueous 0.200M solution of K2Cr2O7. Calculate how many grams are needed and draw a picture of how to make the solution. Molar mass – 294.2 g/mol

1000. mL of 0.200 M K2Cr2O7 from solid K2Cr2O7. ( ) 0.200 moles K2Cr2O7 1.000L = 0.200 mol K2Cr2O7 1.00 L ( ) 294.2 g KMnO4 0.200 mol KMnO4 = 58.8 g K2Cr2O7 1 mol KMnO4

K2Cr2O7 Detailed Directions: Dissolve _____ g of _______ in enough water to prepare _______ mL of solution. Diagram steps below: 58.8 1000. 58.8 g K2Cr2O7 Dissolve Add water to 250 ml

- If we use 1.0L (1000ml) of SOLVENT, what will happen? M = mol / L - Do we need to know the exact amount of water added? The 58.8 g is the …. Solute Solvent Solution The water added is the.. Solute Solvent Solution

Warm up #2 Provide a detailed directions for the preparation of 750. ml of 0.25 M HCl by dilution of a 12M HCl stock solution.

4. 750. mL of 0.25 M from 12 M (concentrated) HCl stock solution. Solve for.. Mc = 12 M Vc = ? Md = 0.25 M Vd = 750. ml McVc = MdVd Vc = Md * Vd Mc Vc = 0.25 mol/L * 750. ml 12 mol/L = 16 ml

12 Recipe: Dilute ____ mL of the _____ M stock solution with enough water to prepare _______ mL of solution. Diagram steps below: 16 750 750. ml 16 ml of 12 M stock mix 750 ml of 0.25M solution