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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

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) ).

Find the pH if only 6.0 instead of 12.0 mL HCl were added.

Why does the buffer capacity reach a maximum when pH=pKa?

Find the pH of 0.10 M methylamine.

BH+ClO4- is a salt formed from the base B (Kb= 1.00脳10-4)and perchloric acid. It dissociates into BH+, a weak acid, and ClO4-, which is neither an acid nor a base. Find the pH of 0.100 M BH+ClO4-.
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