Acid–Base Titrations (OCR A-Level Chemistry A): Flashcards

Definition of titration

Precise analytical technique measuring complete reaction volumes

Standard solution characteristic

Precisely known concentration

Meniscus position on volumetric flask

Bottom of meniscus exactly on graduation mark

Purpose of inverting volumetric flask

Mix solution thoroughly for uniform concentration

Burette reading precision

Nearest $0.05 ext{ cm}^3$, always two decimal places

Definition of titre

Volume of solution added from burette

Concordant results definition

Two titres agreeing within $0.10 ext{ cm}^3$

Formula for moles from conc. & volume

$n = c \times \frac{V}{1000}$

Three steps in titration calculations

1. Find moles known 2. Use equation 3. Calc unknown

Effect of air bubble in burette neck

Erroneously large titre value