Respuesta :
The ph at the equivalence point in the titration of 100 ml of 0.10 m HCN with 0.10 m NaOH is 11.04.
To ascertain the concentration of an identified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A standard solution with a known concentration and volume is prepared as the reagent, also known as the titrant or titrator.
The food business uses titration extensively as an analytical method. It enables food producers to estimate the concentration of a reactant in a sample. For instance, it can be used to determine a food's salt or sugar content or the amount of vitamin C or E, which affects the color of the product.
HCN + OH^- → H2O + CN^-
At the equivalence point, 10 mmol of cyanide ions are held in 200 mL of solution.
[CN^-] = 10 mmol/200 mL = 0,05 M
Kb = 1.0E-14/4.9E-10 = 2.0E-5 corresponding to CN^- + H2O = HCN + OH^-
Kb =[HCN][OH^-]/[CN^-]
2.0E-5 = (y)(y)/(0.05 - y)
y=0.0011 M =[OH^-]
pOH = 2.96
pH = 14.00 - pOH = 11.04
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