Three different indicators are available for the titrations in a-c.^2 For each i

Question

Three different indicators are available for the titrations in a-c.^2 For each indicator, predict the pH of the end point. For each titration in a-c, predict the chemical formula of the salt, relative pH (acidic, basic, or neutral) at the equivalence point, and an appropriate indicator of the three available. Thymol blue K_A, In = 2 Times 10^-9 End Point pH = Bromothymol blue K_A, In = 2 Times 10^-7 End Point pH= Congo red K_A,In = 1 Times 10^-4 End Point pH = NaOH + HC_2H_3O_2 Salt = Eq. Point pH = Indicator = NH_3 + HCl Salt = Eq. Point pH = Indicator = NaOH + HCl Salt = Eq. Point pH = Indicator =

Explanation / Answer

I. Thymol blue- pH = 8.0 - 9.6

II. Bromothymol blue- pH = 6.0 - 7.6

III. Congo red- pH = 3.0 - 5.0

Titrations:

a. NaOH + HC2H3O2 === NaC2H3O2

Equivalence point pH = 8.0-9.0

Indicator = Thymol blue

b. NH3 + HCl === NH4Cl

Equivalence point pH = 4.0-5.0

Indicator = Congo red

c. NaOH + HCl ==== NaCl + H2O

Equivalence point pH = 7.0

Indicator = Bromothymol blue

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