CH1020 Exercises (Worksheet 5) Book Sections: New Material: 8.1 – 8.3 1. Calculate the molarity of each of the following solutions: a. 0.25 mol NaCl in 175 mL of solution 1.4M b. 0.070 mmol AgNO3in 50 μL of solution 1.4M c. 1.2 mmol Na d. 7.8 g NaOH in 150 mL solution 2. Phosphate-buffered saline (abbreviated PBS) is a buffer solution commonly used in biological and biochemical research. A typical composition of a PBS is as follows: 137 mM NaCl 4.00g 2.70 mM KCl 0.100g 10.0 mM Na2HPO4 1.42g 1.80 mM KH2PO40.245g You want to prepare 500 mL of PBS buffer. How many grams do you need of each component of the buffer? 3. The solubility of AgCl in water is 0.002 g/L. Is it possible to make a 0.010 mM AgCl aqueous solution? 4. How many moles of Na are in each of the following solutions: a. 0.7 L of 0.5 M NaCl 0.35 mol Na b. 400 mL of 0.10 M Na3PO40.12 mol Na
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