The Titration Final practice questions — Grade 12 Chemistry

Boss lesson · The Titration Final

Exam-hall rules, one bench

score 0

Exam-hall rules, one bench

This is the boss. No calculator. Every concentration in the cascade is pinned to an exact power of ten, so every logarithm is mental: the pH of $1 \times 10^{-k}$ is $k$ , and halving an even exponent is the hardest arithmetic on the page. One bench runs the whole unit: the volumetric flask dilutes the titrant, the burette finds the acid, the log places it on the scale, the see-saw hands over the other end — and every answer feeds the next line. Write each line down. A wrong dilution rides all the way to a wrong pH, and the finish will trace exactly where the cascade started to slip.

Then the last question does what real chemistry always does: it asks you to decide. A number is not an answer until it has been ruled on. 5★ under par here is the chapter crown. Goggles on, clock in.

$C_a = \frac{n\,C_b V_b}{V_a}$

$C_a$ = Analyte concentration (molar concentration)
$V_a$ = Analyte volume (aliquot) (volume)
$C_b$ = Titrant concentration (molar concentration)
$V_b$ = Titre volume delivered (volume)
$n$ = Mole ratio (analyte per titrant)

Titration: Concentration of an Unknown solver →

$C_1 V_1 = C_2 V_2$

$C_1$ = Initial concentration (molar concentration)
$V_1$ = Initial volume (volume)
$C_2$ = Final concentration (molar concentration)
$V_2$ = Final volume (volume)

Dilution Equation (C1V1 = C2V2) solver →

$\mathrm{pH} = -\log_{10}\,[\mathrm{H^+}]$

$\mathrm{pH}$ = pH
$[\mathrm{H^+}]$ = Hydrogen ion concentration (molar concentration)

pH from Hydrogen Ion Concentration solver →

$\mathrm{pH} + \mathrm{pOH} = 14$

$\mathrm{pH}$ = pH
$\mathrm{pOH}$ = pOH

pH and pOH Relation solver →

$\mathrm{pH} = -\log_{10}\sqrt{K_a\,C}$

$\mathrm{pH}$ = pH of the solution
$K_a$ = Acid dissociation constant
$C$ = Formal acid concentration (molar concentration)

pH of a Weak Acid from Ka solver →

no calculator in the boss room — the numbers are chosen to fit in your head