Concentration: Molarity & PercentLab

Froggy Jumps

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Concentration basics and problems

Estefanía Carrasco

Ecuador

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Concentration: Molarity & PercentLab


Froggy Jumps Concentration: Molarity & PercentLabVersion en ligne Concentration basics and problems par Estefanía Carrasco 1 What is molarity (M) a measure of in a solution? a moles of solute per liter of solution b percent by volume of solute in solvent c grams of solute per liter of solution 2 Choose the correct unit for molarity. a mol per liter (mol/L) b g/L c mol/g 3 A 1.0 M solution contains how many moles of solute per liter? a 10 moles b 0.1 mole c 1 mole of solute 4 If 2.0 moles of NaCl are dissolved to make 2.0 L of solution, what is the molarity? a 1.0 M b 2.0 M c 0.5 M 5 What does % w/w denote in solutions? a volume percentage b mass percentage by mass c molar percentage 6 If 50 g of solute is dissolved in 500 g of solution, the mass percent is? a 10% w/w b 5% w/w c 50% w/w 7 How do you convert from mass percent to molarity? a use density to convert mass to volume and calculate moles b divide percent by 10 c ignore density and use grams 8 A 0.250 M solution has 0.250 moles per liter. What is its volume if you have 0.500 moles? a 1.00 L b 0.125 L c 2.00 L 9 What is the percent concentration by volume (v/v) used for liquids? a mass per mass b moles per liter c volume of solute per total volume, times 100