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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脳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-鈬�A-+H2O

Calculate the equilibrium constant using the formula,

K=1Kb1KwKa=KwKa=10-6.2710-14=5.4脳107

Hence the equilibrium constant isK=5.4脳107 .

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Most popular questions from this chapter

Calculate the pH at each point listed for the titration of 50.0 mL of 0.050 0 M formic acid with 0.0500 M KOH. The points to calculate are , 10.0, 20.0, 25.0, 30.0, 40.0, 45.0, 48.0, 49.0, 49.5, 50.0, 50.5, 51.0, 52.0, 55.0, and 60.0 mL. Draw a graph of pH versus Vb.

Titration on Diprotic Systems

11-29 Find the pH of the solution when 0.0100M tyrosine is titrated to the equivalence point with0.00400MHCIO4.

Constant-boiling aqueous HCl can be used as a primary standard for acid-base titrations. When,20 wt% HCl (FM 36.461) is distilled, the composition of the distillate varies in a regular manner with the barometric pressure:

(a) Make a graph of the data in the table to find the weight percent of HCl collected at 746 Torr.

(b) What mass of distillate (weighed in air, using weights whose density is 8.0 g/mL) should be dissolved in 1.000 0 L to give 0.100 00 M HCl? The density of distillate over the whole range in the table is close to 1.096

g/mL. You will need this density to change the mass measured in vacuum to mass measured in air. See Section 2-3 for buoyancy corrections.

Sketch the general appearance of the curve for the titration of a weak base with a strong acid. What chemistry governs the pHin each of the four distinct regions of the curve?

Finding the End Point with a pH Electrode

11-33What is a Gran plot used for?
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