If ethyl acetate has the highest vapor pressure, which way would the reaction mo

Question

If ethyl acetate has the highest vapor pressure, which way would the reaction most likely shift if the top popped off the flask during the 48 hour waiting period? The reaction will shift to the right. The reaction is at equilibrium. The reaction will shift to the left. The reaction will not occur. None of the above What is the concentration of a sodium hydroxide solution if 0.5567 g of KHP (MW = 204.23 g/mole) requires 22.67 mL of the base to reach endpoint in a titration? KHP and NaOH react in a 1:1 mole ratio. 3.705 times 10^-3 M 9.511 times 10^-2 M 1.202 times 10^-1 M 0.1443 M none of the above

Explanation / Answer

1. The solvent in a reaction keeps the reactants in solution phase, allowing them to react. It also helps in controlling the temperature of the exothermic and endothermic reactions. When the solvent evaporates from the reaction flask, as in this case the ethyl acetate evaporated due to high vapour pressure, the reactants will not be in a homogeneous phase and the reaction will not occur.

2. number of moles of KHP = mass of KHP/ Molar mass of KHP

ie n = 0.5567g / 204.23 g mol-1

therefore, n = 2.73 X 10-3 mol

Since KHP and NaOH react in 1:1 mole ratios, number of moles of NaOH will be 2.73 X 10-3 mol

concentration of NaOH = number of moles of NaOH / Volume of NaOH

= 2.73 X 10-3 mol / 22.67 X 10-3 L

therefore, concentration of NaOH = 0.1202 mol L-1 = 1.202 X10-1 M for 1 mol L-1 = 1 Molar

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