91Ó°ÊÓ

Give precise instructions to your laboratory assistant as to how to prepare \(1.00 \mathrm{~L}\) of a \(1.00 \mathrm{M}\) aqueous solution of sucrose, \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\). Remember that she will be measuring out the sucrose in grams. She has available a 1-L volumetric flask.

Give precise instructions to your laboratory assistant as to how to prepare \(1.00 \mathrm{~L}\) of a \(0.250 \mathrm{M}\) aqueous solution of sucrose, \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\). Remember that she will be measuring out the sucrose in grams. She has available a 1-Lvolumetric flask.

Give precise instructions to your laboratory assistant as to how to prepare \(0.500 \mathrm{~L}\) of a \(1.50 \mathrm{M}\) aqueous solution of sucrose, \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\). Remember that she will be measuring out the sucrose in grams. She has available a 0.50-L volumetric flask.

Your assistant tells you she measured out \(2.50\) moles of \(\mathrm{NaCl}\) and then added enough water to get \(500.0 \mathrm{~mL}\) of solution to prepare a \(5.00 \mathrm{M}\) solution of \(\mathrm{NaCl}\). (a) What was the mass of the \(\mathrm{NaCl}\) in grams? (b) Did she successfully prepare a \(2.5 \mathrm{M}\) solution? Prove your answer.

Your assistant tells you he measured out \(116.886\) \(\mathrm{g}\) of \(\mathrm{NaCl}\) and then added exactly \(1.00 \mathrm{~L}\) of water to it to prepare a \(2.00 \mathrm{M}\) solution of \(\mathrm{NaCl}\). Do you fire him or give him a promotion? Explain.

You have \(2500.0 \mathrm{~mL}\) of a \(0.250 \mathrm{M}\) solution of \(\mathrm{NaCl}\). (a) How many moles of \(\mathrm{NaCl}\) are present in this solution? (b) How many moles of ions are present in this solution? (c) How many grams of \(\mathrm{NaCl}\) would you recover if you evaporated all of the water off of this solution?

You have \(45.0 \mathrm{~mL}\) of a \(0.250 \mathrm{M}\) solution of sucrose, \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\) (a) How many moles of \(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\) are present in this solution? (b) How many grams of sucrose would you recover if you evaporated all of the water off of this solution? (c) A student says that if you did part (b) and recovered all of the evaporated water as a liquid, you would get \(45.0 \mathrm{~mL}\) of liquid water. Is this student correct? Explain.

How many milliliters of a \(1.00 \mathrm{M}\) solution of \(\mathrm{NaCl}\) are required to obtain \(5.00 \mathrm{~g}\) of \(\mathrm{NaCl} ?\)

How many milliliters of a \(0.250 \mathrm{M}\) solution of glucose, \(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\), are required to obtain \(100.0 \mathrm{~g}\) of glucose?

There is a bottle of \(0.500 \mathrm{M}\) sucrose stock solution in the laboratory. Give precise instructions to your assistant on how to use the stock solution to prepare \(250.0 \mathrm{~mL}\) of a \(0.348 \mathrm{M}\) sucrose solution.