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Chapter 9: Q3P (page 208)

Neglecting activity coefficients, calculate the pH of5.0脳10-8MHCIO4What fraction of H+is derived from dissociation of water?

Short Answer

Expert verified

The pH value of 5.0脳10-8MHCIO4=6.89

The fraction of H+derived from dissociation of water = 0.61

Step by step solution

01

Define pH

pH stands for Potential hydrogen. It is the symbol for the logarithm of the reciprocal of hydrogen ion concentration in gram atoms per litre, used to express the acidity and alkalinity of a solution on a scale of 0to14

02

 Step 2: Determining the charge balance and mass balance 

Charge balance:H+=OH-1+CIO4-鈬�OH-=H+-5脳10-8

mass balance = charge balance

H+OH-=KwH+H+-5脳10-8-1脳1014H+=1.28脳10-7

03

Calculating the pH value

Substituting the value ofH+ in the pH formula we get

pH=-logH+=6.89

04

Calculating the fraction of total H+ from dissociation of water

OH-=Kw/H+=7.8脳10-8M

Fraction of total H+from role="math" localid="1654777778226" H2O=7.8脳10-8M1.28脳10-7M=0.61

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Most popular questions from this chapter

Select a compound from Table 9-2 that you could use to make 250mLof 0.2Mbuffer with a pH of 6.0. Explain how you would make the buffer.

Describe how to prepare 250mLof 1.00M ammonia bufferpH9.00 starting with 28 wt %NH3(鈥渃oncentrated ammonium hydroxide鈥� listed on the back inside cover of the book) and 鈥渃oncentrated鈥滺CI(37.2 wt %)or 鈥渃oncentrated鈥� NaOH(50.5wt%)

Excel Goal Seek. Solve the equation x2/(F-x)=Kby using Goal Seek. Guess a value of xin cell A4 and evaluate x2/(F-x)in cell B4. Use Goal Seek to vary the value of xuntil x2/(F-x)is equal to K. Use your spreadsheet to check your answer to Problem 9-6.

Barbituric acid dissociates as follows:

(b)Calculate the pH and fraction of dissociation of 10-10.00 M barbituric acid.

Which of the following bases would be most suitable for preparing a buffer of pH9.00?

(i) NH3(ammonia,Kb=1.76脳10-5);

(ii) role="math" localid="1654764490555" C6H5NH2(aniline,role="math" localid="1654764515634" C6H5NH2 );

(iii)H2NNH2(hydrazine,Kb=1.05脳10-6)));

(iv) C6HsNH2(pyridine,Kb=1.58脳10-9) ).
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