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How to calculate the pH of the neutralisation of HCN with excess of KOH?

The OH− resulting from KOH (0.06 M) that dissociation now push the equilibrium: Kb=[HCN]×[OH−]/[CN−] The contribution of the [OH−] coming from the hydrolysis of the cyanide can be ignored. Only the [...
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-1 votes

Why is there a charge on COOH⁻¹?

You have convoluted a simple chemical into a ponderous problem. The formula as written [H-CO-OH] implies that is there is a H attached to carbon and a H attached to oxygen. The conjugate base as ...
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6 votes

What is the pKa value of the nitrogen atoms, specifically the amine groups?

The nitrogen atoms are attached to the aromatic ring, and this placement is the dominant factor. The conjugate acid formed by protonating either nitrogen atom would be expected to have a $\mathrm pK_\...
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Why are silver halides insoluble in nitric acid

The diagnostic test for Cl-, Br- and I- is reaction with Ag+ in a dilute nitric acid solution. The reason for the nitric acid is not because the silver halides are not attacked by nitric but that the ...
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2 votes
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Hydrofluoric acid

Liquids with unlimited miscibility with water, like ethanol, sulfuric acid and hydrofluoric acid do have different densities than water. This may lead to layered state, if one liquid is intentionally ...
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Why do amphiprotic substances react to completion in acidic and basic conditions?

The appropriate form of a chemical reaction is determined by the context or purpose the reaction is describing or illustrating. Unidirectional reactions for titrations, synthesis, reaction schemas ...
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1 vote

intramolecular h-bonding in maleic acid

In the nitrophenol case, H bond stabilizes the o-nitrophenol acid that becomes less acidic. In the dicarboxyethene case, the H bond stabilizes the carboxylate of maleinic acid, what makes it less ...
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6 votes

Conductometric titration curve plotting

Expressed in $\pu{\Omega ^{-1} cm^2 mol^{-1}}$, the ionic conductance of usual ions like $\ce{Na+, K+, Ca^{2+}, Cl-, SO4^{2-}}$ are between $50$ and $80$. But the two ions $\ce{H+}$ and $\ce{OH-}$ ...
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3 votes

pH calculation of a mixure containing 2 strong acids and a buffer mixture

First, you have to allow the strong acids to react with the weak base. $$\ce{HCl + NaOAc -> HOAc + Na+ + Cl-}$$ $$\ce{HNO3 + NaOAc -> HOAc + Na+ + NO3-}$$ This goes to completion. As a result, ...
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