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1(a)A solution that is formed by combining 400 mL of 0.025 molar HCl with 600 mL of 0.015 molar NaOH has a pH of_______ ? Please, can u explain to me...

1(a)A solution that is formed by combining 400 mL of 0.025 molar HCl with 600 mL of 0.015 molar NaOH has a pH of_______ ? Please, can u explain to me hoe to do it?

(b)What is the pH of a solution which is 0.0100 M in HA and also 0.0020 M in NaA (Ka = 9.0 * 10-6)?
I think answer is 5.65, is that correct?

(c)A sample of ammonia (Kb = 1.8 * 10-5) is titrated with 0.1 M H2SO4. At the equivalence point, the pH is approximately______ ?
I think 5 not too sure.




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1(a)
Milli moles of HCl=400*0.025=10
Milli moles of NaOH=600*0.015=9
So Moles of acid are neutarlised by base and forms a salt
The remaining acid i.e 1 millimole of HCl contributes to pH
So...

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