Quiz | Chemical Calculations for Solutions
General Chemistry 2 - Quiz
Which of the following factors affects the solubility of a particular substance?
Solubility is the maximum quantity of solute dissolvable in a solvent at a particular temperature. A solid is more soluble at higher temperatures and in a solvent with similar types of intermolecular forces
What is the molarity of a solution that contains 8 moles of solute in 2 liters of solution?
Molarity M = = = 4M
What is the mass of NaCl in 250 mL of a 0.4 M solution?
number of moles nNaCl = M x Vsolution =
⇒ mNaCl = M x Vsolution x MNaCl with MNaCl = molar mass of NaCl = MNa + MCl = 23.0 + 35.4 = 58.4 g.mol-1
⇒ mNaCl = 0.4 x 0.250 x 58.4 = 5.84 g
What does not change when a solution is diluted by the addition of solvent?
In dilution, the amount of solute does not change: the number of moles are the same before and after dilution
How many mL of a 2.0 M NaBr solution are needed to make 300.0 mL of 0.5 M NaBr?
In dilution, the amount of solute does not change: n1 = n2 ⇒ M1 x V1 = M2 x V2
2.0 x V1 = 0.5 x 0.300 ⇒ V1 = 0.075 L = 75 mL
What is the endpoint of a titration?