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.
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
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
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