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Chapter 11: Q9P (page 259)

Find the equilibrium constant for the reaction of MES (Table9-2) withNaOH .

Short Answer

Expert verified

The equilibrium constant for the reaction of MES isK=5.4×107 .

Step by step solution

01

Define equilibrium constant.

When a chemical reaction is in equilibrium, the equilibrium constant gives information on the relationship between the reactants and products.The equilibrium constant is defined as the ratio of product concentration to reactant concentration, both elevated to their corresponding stoichiometric coefficients. It is given by the formula,

Kequ=kf/kb=CcDd/AaBb=Kc

where,

Kcis the equilibrium constant expressed in moles per liter.

02

Find the equilibrium constant.

The given reaction is a reaction between weak acid and a strong base.

HA+OH-⇌A-+H2O

Calculate the equilibrium constant using the formula,

K=1Kb1KwKa=KwKa=10-6.2710-14=5.4×107

Hence the equilibrium constant isK=5.4×107 .

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Most popular questions from this chapter

Finding the end point from pH measurements. Here are

data points around the second apparent end point in Figure 11-5:

(a) Prepare a spreadsheet or table analogous to Figure 11-6, showing

the first and second derivatives. Plot both derivatives versusvb

and locate the end point in each plot.

(b) Prepare a Gran plot analogous to Figure 11-8. Use the least-squares

procedure to find the best straight line and find the end point. You will

have to use your judgment as to which points lie on the “straight” line.

Write the chemical reactions (including structures of reactants and products) that occur when the amino acid histidine is titrated with perchloric acid. (Histidine is a molecule with no net charge.) A solution containing \(25.0\;{\rm{mL}}\) of \(0.0500{\rm{M}}\)histidine was titrated with \(0.0500{\rm{M}}\)\({\rm{HCl}}{{\rm{O}}_4}\). Calculate the pH at the following values of\({V_{\rm{a}}}:0,4.0,12.5,25.0,26.0\)and\(50.0\;{\rm{mL}}\).

Use activity coefficients to calculate thepHafter10.0mLof0.100Mtrimethylammonium bromide were titrated with4.0mLof0.100MNaOH.

Find the pH when Va = 14.63 mL.

The dibasic compound B (pKb1 = 4.00, pKb2 = 8.00) was titrated with 1.00 M HCl. The initial solution of B was 0.100 M and had a volume of 100.0 mL. Find the pH at the following volumes of acid added and make a graph of pH versus Va: Va = 0, 1, 5, 9, 10, 11, 15, 19, 20, and 22 mL
See all solutions

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