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Homework 2

# Homework 2 - huynh(hph268 HW 2 Sathasivan(49810 This...

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huynh (hph268) – HW 2 – Sathasivan – (49810) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Read the article Sect 3: Special Properties of Water and Aqueous Solutions How many milliliters of 5.5 M NaOH are needed to prepare 300 mL of 1.2 M NaOH? 1. 65 mL correct 2. 300 mL 3. 100 mL 4. 200 mL Explanation: You dilute a solution whenever you add solvent to a solution. Adding solvent results in a solution of lower concentration. You can calculate the concentration of a solution following a dilution by applying this equation: M 1 V 1 = M 2 V 2 , where M is molarity, V is volume, and the subscripts 1 and 2 refer to the initial and final values: V 1 = M 2 V 2 M 1 = (1 . 2 M) (300 mL) 5 . 5 M = 65 . 4545 mL To prepare the 1.2 M NaOH solution, you pour 65 mL of 5.5 M NaOH into your con- tainer and add water to obtain a final volume of 300 mL. 002 10.0 points What is the molarity of a solution prepared by dissolving 10.5 grams of NaF in enough water to produce 750 mL of solution?

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