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# Calculate the molality (m), boiling point elevation (Tb) and freezing point depression (Tf) for an aqueous solution made by dissolving 20.2 g of...

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• Calculate the molality (m), boiling point elevation (ΔTb) and freezing point depression (ΔTf) for an aqueous solution made by dissolving 20.2 g of sucrose in 70.1 g of water.

(Mm C12H22O11 = 342.30 g/mol)

Boiling point elevation equation: ΔTb = Kb · m, where Kb = 0.512°C/m

Freezing point depression equation: ΔTf = Kf · m, where Kf = 1.86°C/m

 Molality (m) ΔTb (in °C) ΔTf (in °C)

• Calculate the number of moles of BaCl2 in 25.0 mL of a 0.150 M solution.

 Number of moles of BaCl2

Calculate the molarity (M) of 208.25 g KBr in 0.750 L of solution?

(Mm KBr = 119.00 g/mol)

 Concentration of KBr (in M)

• What volume of 16.0 M HNO3 is needed to prepare 250. mL of dilute 0.500 M HNO3?

Dilution equation: MconcVconc = MdilVdil

 Vconc (in mL)

What volume of this freshly prepared 0.500 M HNO3 would be needed to neutralize 2.00 g of Ca(OH)2?

(Mm Ca(OH)2 = 74.09 g/mol)

Ca(OH)2(s) + 2 HNO3(aq) → Ca(NO3)2(aq) + 2 H2O(l)

 V (in mL)

• 4.Hydrochloric acid is a common acid used in the undergraduate chemistry laboratory. It is a strong acid due to the fact that it completely ionizes according to the following equation:

HCl(aq) + H2O(l) → Cl(aq) + H3O+(aq)

Consider a fairly dilute solution of HCl with a concentration of 0.025 M. Calculate the following information and be sure to show your work and how you arrived at your answers.

 pH pOH [H3O+] (M) [OH−] (M)

1. Calculate the molality ( m ), boiling point elevation (ΔT b ) and freezing point depression (ΔT f ) for an aqueous solution made by dissolving 20.2 g of sucrose in 70.1 g of water. (M m C 12 H 22 O 11 = 342.30 g/mol) Boiling point elevation equation: ΔT b = K b · m , where K b = 0.512°C/ m Freezing point depression equation: ΔT f = K f · m , where K f = 1.86°C/ m Molality (m) ΔT b (in °C) ΔT f (in °C) 2. Calculate the number of moles of BaCl 2 in 25.0 mL of a 0.150 M solution. Number of moles of BaCl 2 Calculate the molarity (M) of 208.25 g KBr in 0.750 L of solution? (M m KBr = 119.00 g/mol) Concentration of KBr (in M ) 3. What volume of 16.0 M HNO 3 is needed to prepare 250. mL of dilute 0.500 M HNO 3 ? Dilution equation: M conc V conc = M dil V dil V conc (in mL) What volume of this freshly prepared 0.500 M HNO 3 would be needed to neutralize 2.00 g of Ca(OH) 2 ? (M m Ca(OH) 2 = 74.09 g/mol) Ca(OH) 2 ( s ) + 2 HNO 3 ( aq ) Ca(NO 3 ) 2 ( aq ) + 2 H 2 O( l ) V (in mL) 4.Hydrochloric acid is a common acid used in the undergraduate chemistry
laboratory. It is a strong acid due to the fact that it completely ionizes according to the following equation: HCl( aq ) + H 2 O( l ) Cl ( aq ) + H 3 O + ( aq ) Consider a fairly dilute solution of HCl with a concentration of 0.025 M . Calculate the following information and be sure to show your work and how you arrived at your answers. pH pOH [H 3 O + ] ( M ) [OH ] ( M )

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