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Chapter 9: Q19P (page 209)

Find the pH and fraction of association(伪)of a 0.100Msolution of the weak base B withKb=1.00脳10-5.

Short Answer

Expert verified

pH = 11.00;伪=9.95脳10-3

Step by step solution

01

Definition of pH

The pH is the quantitative measure of acidity or basicity of liquid solutions.

02

Find the value of x for the weak base

We will consider the following,

B=0.1-xOH=BH+=x

First, we will calculate the value ofas follows:

kb=x20.1-x1.00脳10-5=x20.1-xx=9.95脳104M

03

Finding the pH value and fraction of association

Next, we will calculate the pH value of the solution and the fraction of association.

pOH=-logx=-log9.95脳104=3.00pH=14-3.00=11.00

伪=x/F=9.95脳104/0.1=9.95脳10-3

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Most popular questions from this chapter

Calculate the pH of a solution prepared by mixing 0.0800mol of chloroacetic acid plus0.0400mol of sodium chloroacetate in1.00L of water.

(a) First do the calculation by assuming that the concentrations of HA andA- equal their formal concentrations.

(b) Then do the calculation, using the real values of and in the solution.

(c) Using first your head, and then the Henderson-Hasselbalch equation, find the pH of a solution prepared by dissolving all the following compounds in one beaker containing a total volume of1.00L:0.180molCICHCOO2H,0.020molCICHCHO2Na20.080molHNO3,and0.080molCa(OH)2. Assume thatCa(OH)2 dissociates completely.

Find pH if pKa=3.00instead of 2.00Does the answer make sense?

Find the pH if only 6.30 instead of 12.0 mL HCl were added

Show that the limiting fraction of association of a base in water, as the concentration of base approaches0,isa=107Kb/(1+107Kb)Find the limiting value ofaforKb=10-4and forKb=10-10

Find theand fraction of dissociation ( a ) of a 0.100Msolutionof the weak acid HAwith Ka=1.00脳10-5
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