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What mass of HClO4 should be present in 0.556 L of solution to obtain a solution with each pH value?

Chemistry
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What mass of HClO4 should be present in 0.556 L of solution to obtain a solution with each pH value? 

(a) pH = 2.47 
  g 

(b) pH = 1.47 
 g 

(c) pH = 0.47 
 g
Oct 5th, 2014

1. Answer is 0.189gm for a ph value of 2.47

[H+] = 10^-2.47 =0.00338 M 

moles HClO4 = 0.00338 x 0.556 L =0.00188
Mass HClO4 = 0.00188 x 100.461 g/mol =0.189g


2. Answer is 1.89gm for a ph value of 1.47

[H+] = 10^-1.47 =0.03388 M 

moles HClO4 = 0.03388 x 0.556 L =0.01884

Mass HClO4 = 0.01884 x 100.461 g/mol =1.893g


3. Answer is 18.93 gm for a ph value of 0.47

[H+] = 10^-0.47 =0.3388 M

moles HClO4 = 0.3388 x 0.556 L =0.1884

Mass HClO4 = 0.01884 x 100.461 g/mol =18.93g


Oct 6th, 2014

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