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What is the mass fraction of KOH and water in thesolution?

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Casey Durgan
Casey DurganLv2
15 Jan 2019

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Related questions

A solution of KOH contains 15.0 g of KOH in 185.0 g water. What is the mass percent of KOH in the solution?

a. 5.82 %

b. 8.11 %

c. 7.50 %

d. 75.0 %

A concentrated potassium hydroxide solution is 45.0% KOH by mass and has a density of 1.44 g/mL at 25°C. The remainder of material is solvent. What is the molality of KOH in the solution?

1. When 5.0 g of KOH were dissolved in 74.0 g water in a calorimeter at 23.9oC, the temperature of the solution went up to 37.8oC.

Is the solution endothermic or exothermic? Why?

2. When 5.0 g of KOH were dissolved in 74.0 g water in a calorimeter at 23.9oC, the temperature of the solution went up to 37.8oC.

What is ΔH for the solution of one mole KOH in water with the unit of KJ/mole?

3. A student obtained an unknown metal sample that weighed 65.3 g and at a temperature of 99.8oC, he placed it in a calorimeter containing 43.7 g of water at 25.7oC. At equilibrium the temperature of the water and metal was 34.5oC.

Knowing the specific heat of the water to be 4.18 J/goC, what is the specific heat of the metal?

[ Hint: S.H.water x mwater x Δt water= S.H.metal x mmetal x Δt metal ]

4. Assuming that KOH exists as K+ and OH- ions in solution, what is the equation that occurs when KOH is dissolved in water?

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