What is the concentration of hydrochloric acid
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What is the concentration of hydrochloric acid

[From: ] [author: ] [Date: 12-03-13] [Hit: ]
my answer was 0,2 mol/dm^3.-Your ans. is correct.Original HCl soln. was 10 mL which completely neutralizes 20 x 0.......
what is the concentration of hydrochloric acid. If we know that the volume of hydrochloric acid is 10cm^3. We added 25cm^3 deionized water. The required volume of sodium hydroxide for the substance to get pH = 7 is 20cm^3 with a concentration of 0.1 moll/dm^3

what is the concentration of hydrochloric acid? my answer was 0,2 mol/dm^3.

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Your ans. is correct.
Original HCl soln. was 10 mL which completely neutralizes 20 x 0.1 =2 mmole NaoH
So 10 mL HCl has 2 mmole HCl
and 1000mL has 200mmole or 0.2 moles
Concn. HCl= 0.2mol/L

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HCl(aq) + NaOH(aq) -> NaCl(aq) + H2O(l)

From the equation; 1 mol of NaOH neutralises 1 mol of HCl. Therefore...

n(HCl) = n(NaOH) = cV = 0.1 x 0.020 = 0.0020 mol

c(HCl) = n/V = 0.002/0.035 = 0.057M = 0.057 mol/dm^3
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