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christopherwilde
12.06.2020 •
Chemistry
A 25.0 mL sample of an KOH solution is titrated with 0.60 M H2S04. The equivalence point is reached after the addition of 30.0 mL of the H2S0, solution. What is the concentration of the KOH solution?
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Ответ:
Explanation:
The HCO₃ in NaHCO₃ has an oxidation state of -1. We know this because of the charge on HCO₃ and also by the fact that Na is a group 1 metal that always has a +1 oxidation state.
The sum of the oxidation states of the components of HCO₃ has to be equal to -1
⇒ H + C + 3 O = - 1
A rule of redox is that Oxygen always has a - 2 oxidation state and H usually has a + 1 oxidation state
⇒ 1 + C + 3(-2) = - 1 [make C the subject of the equation and simplify]
⇒ C = -1 - 1 + 6
C = + 4