How many milliliters of a 0 250 M solution can be prepared by dissolving 4.00 g

Question

How many milliliters of a 0 250 M solution can be prepared by dissolving 4.00 g of NaCl in water? How many grams of lithium bromide, LiBr, could be recovered by evaporating 550. mL of 20.0 percent LiBr solution to dryness (d = 1.34 g/mL)? How many milliliters of 6.0 M HCl is needed to prepare 500. mL of a 0.150 M HCl solution? A sample of potassium hydrogen phthalate, HKC_4H_4O_4, weighing 0.512 g was dissolved in water and titrated with 24.82 mL of an NaOH solution. Calculate the molarity of the NaOH solution. How many grams of HNO_3, are in 75. mL of concentrated (18 M) HNO_3, solution?

Explanation / Answer

mol. wt of NaCl = 58.44g/mol

no of moles = 4/58.44 = 0.068

molarity = moles of solute/ litre of solution

litre of solution = 0.068/0.25 = 0.2737 litre

or 273.7 mL of water is required.

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