General Chemistry Answers

1. why it is important to measure cation exchange capacity
2. factors that influence CEC of soils; a range of CEC for different soil textures and clay minerals and soil colloids

What are the [H₃O⁺] and pH of 0.085M weak base C₂H₅NH₂?

The normal freezing point of ethanol is -117.30 oC. How many grams of electrolyte KF (molar mass=58.1 g/mole) must be added to 35.0 g of ethanol (Kf(ethanol)=1.99 oC/m) to change its freezing point to -120.25 oC?

The equilibrium constant for the chemical equation

N₂ (g) + 3H₂ (g) −⇀ 2NH₃ (g)

is K_p = 0.0301 at 199*C. calculate the value of K_c for the reaction at 199*C

K_c = ?

Calculate the value of K_p for the equation

C (s) + CO₂ (g) −⇀ 2CO (g) K_p = ?

given that at a certain temperature.

C (s) + 2H₂O (g) −⇀ CO₂ (g) + 2H₂ (g) K_p1 = 3.95

H₂ (g) + CO₂ (g) −⇀ H₂O (g) + CO (g) K_p2 = 0.799

K_p = ?

Sr(OH)2 + Li2SO4 = Sr(SO4) + LiOH

Spectator ions:

what are the spectator ions of lithium sulphate and strontium hydroxide

Two reactions and their equilibrium constants are given.

A + 2B −⇀ 2C K₁ = 2.81

2C −⇀ D K₂ = 0.194

Calculate the value of the equilibrium constant for the reaction

D −⇀ A + 2B.

K = ?

The normal freezing point of ethanol is -117.30 oC. How many grams of electrolyte KF (molar mass=58.1 g/mole) must be added to 35.0 g of ethanol (Kf(ethanol)=1.99 oC/m) to change its freezing point to -120.25 oC?

2

At 325 K, this reaction has a K_c value of 0.0853.

X (g) + 3Y (g) −⇀ 2Z (g)

calculate K_p at 325 K. Note that the pressure is in units of atmosphere (atm).

K_p = ?