A land field near a chemical storage is contaminated by a highly toxic substance (hydrogen cyanide, HCN). The soil pH is around 8.1. To avoid severe evaporation of HCN, most of it should be in CN- form (>= 99%). What will be the minimum pH? HCN = CN- + H* pka = 9.2

A land field near a chemical storage is contaminated by a highly toxic substance (hydrogen cyanide, HCN). The soil pH is around 8.1. To avoid severe evaporation of HCN, most of it should be in CN- form (>= 99%). What will be the minimum pH? HCN = CN- + H* pka = 9.2

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter15: Additional Aqueous Equilibria

Section: Chapter Questions

Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

A land field near a chemical storage is contaminated by a highly
toxic substance (hydrogen cyanide, HCN). The soil pH is around 8.1.
To avoid severe evaporation of HCN, most of it should be in CN-
form (>= 99%). What will be the minimum pH?
HCN = CN- + H+
pka = 9.2
The soil is mainly buffered by carbonate species with the
concentration of 0.1 M. How much NAOH (in M) is needed to
achieve the minimum desirable pH?

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