help I can\'t solve these I have been trying all night 5. How many milliliters o
ID: 576379 • Letter: H
Question
help I can't solve these I have been trying all night
5. How many milliliters of 0.750 M NaOH would contain exactly 5.00 g of NaOH? 6. Hydrochlorie acid is purchased as a 12.1 M solution. How many milliliters of 12.1 M hydrochloric acid must be diluted with water to prepare 2.00 L of 0.200 M acid? 7. How many milliliters of 10.0 M sodium hydroxide must be used to prepare 500 mL of 0.100 M NaOH solution? 8. What volume of 4.75 M copper sulfate, Cuso4, must be used to prepare 5.00 L of 0.250 M copper sulfate solution? 9. How many grams of nickel (II) chloride hexahydrate are required to prepare 250 mL of aqueous solution whose concentration is 0.255 M? 10. An agricultural chemist wished to study the effect of varying fertilizer applications on the growth of tomato plants. The chemist prepared a stock" aqueous solution of urea, (NH2)2CO, by dissolving 1.75 g of this compound in water to make 1.00 L of solution. Then she prepared a series of more dilute solutions to apply to her tomato plants. One of these solutions contained 5.00 mL of "stock" solution diluted to give a final volume of 25.00 mL. What was the concentration of urea in this diluted solution?Explanation / Answer
5. Given, 0.750 M NaOH means 0.750 moles of NaOH per litre of solution.
0.750 mole = 0.750 mol x 39.997g/mol =29.998 g
29.998 g NaOH is contained in 1 L of solution
5 g NaOH will be contained in 1/29.998 x 5 L = 0.1667 L or 166.7 ml
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