GAME KA NA BA?

10g of NaCl is dissolved in 100mL of water producing 102mL of salt water solution. What will be the resulting molarity and molality? NaCl =

• 0.85m

  0.86M

• 1.68M

  1.71m

• 0.85M

  0.86m

• 1.68m

  1.71M

• None of the above

Answer explanation

To get the mass of a pure substance, multiply by density. water has a density of 1 g/mL.

100mL x 1g/1mL = 100g

What is the mass in kg of 100mL HCl? d=1.19kg/L

• 0.12kg

• 1.2kg

• 11.9kg

• 119kg

Answer explanation

the volume is simply multiplied to the density. DO NOT FORGET TO CONVERT.

What is the molarity of 37% w/w HCl. d=1.19kg/L

• 10M

• 12M

• 14M

Which solute is the most soluble at room temperature?

• C12H22O11

• LiCl

• KCl

• NaCl

• None of the above

Answer explanation

Sucrose or table sugar is soluble up to 100g/100g of water in 23-25 degree celsius.

Which solute would be saturated at 165g in 150g of water at 70C?

• C12H22O11

• LiCl

• KCl

• NaCl

• None of the above

Answer explanation

LiCl is soluble up to 110g/ 100 of water at 70degree Celsius.

Which of the following has the most valence?

• Hydrogen sulfate

• barium sulfate

• calcium arsenate

• ferric hydroxide

Answer explanation

Ca3(AsO4)2 = 6

Fe(OH)3 = 3

BaSO4 = 2

H2SO4 = 2

How many mL of 0.3 M barium nitrate are required to precipitate all the sulfate ions from 50.0 mL of 0.4 M aluminum sulfate as barium sulfate?

• 12.5mL

• 37.5mL

• 66mL

• 200mL

Answer explanation

Convert MOLARITY to NORMALITY by multiplying to their valence. Then, perform the neutralization reaction.

All of the following statements on solution equilibrium is not false, except:

• Supersaturation occurs when recrystallization is faster than solvation of solutes.

• Temperature directly increases the amount of solute dissolvable in the solution.

• Recrystallization starts when undissolved solutes merges with dissolved ions.

• Saturated solutions become supersaturated upon heating.

Answer explanation

Saturation occurs when recrystallization and solvation of solute occurs at equal rate.

Which of the following statements is not false about ion-dipole forces between NaCl and Water?

• Hydration shell is formed around the undissolved solute.

• The solute dissociates into ions upon dissolution in water.

• The Chloride ion forms ion dipole force with the negative end of the solvent dipole.

• The sodium ion attracts the Hydrogen of the water towards itself.

Which of the following value can be derived from the density of the solution?

• Mass of the solute

• Mole of the solute

• Volume of the solute

• volume of the solvent