For all stars show all WORK and CALCULATIONS What is a pH? How is pH related to

Question

For all stars show all WORK and CALCULATIONS

What is a pH? How is pH related to concentration of acid and base? As [H + ] increases what happens to the pH? As [OH - ] increases what happens to the pH? What is the equivalence point in a titration? A strong acid is neutralized with a strong base, what is the pH of the solution at the equivalence point? Why? What is the molarity of a 10.0 mL sample of HCl that was neutralized using 27.34 mL of 0.09785 MNaOH Calculate the relative average deviation in ppt for the results obtained by a student who calculated the Molarities of HCl as follows: 0.2456 M, 0.2458 M, and 0.2464 M.

Explanation / Answer

1) pH is measure of strength of acid ,

pH = -log [H+]

2) If pH < 7 the solution is said to be acidic , if pH > 7 solution is basic.

3) as [H+] increases pH decreases

4) as [OH-] increases pH increases

5) When number of moles of acid = number of moles of base during titration , at that point it is said to be equivalence point.

6) When strong and strong base interacts we get neutal water and salts. pH = 7 ( neutral)

7) Molarity of HCl x Vol of HCl = Molarity of NaOH x vol of NaOH

M (HCl) x 10 = 0.09785 x 27.34

M(HCl) = 0.2675

8) devitions are = ( 0.2675-0.2456) = 0.0219 ,

0.2675- 0.2458 = 0.0217,

0.2675-0.2464 = 0.0211

relative deviations = ( 0.0219/0.2675) = 0.0819

( 0.0217/0.2675) = 0.0811

( 0.0211/0.2675) = 0.0789

avg of all = ( 0.0819+0.0811+0.0789)/3 = 0.0806

  

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