Exam-Style Volumetric Problems (Leaving Cert Chemistry): Flashcards

First principles method and formula method

Starts with basic definitions, systematic, time-consuming

Starts with formula, faster, ideal for exams

$\text{moles} = \frac{\text{mass}}{\text{RMM}}$

$\text{moles} = \frac{\text{volume} \times \text{molarity}}{1000}$

$\frac{V_a \times M_a}{n_a} = \frac{V_b \times M_b}{n_b}$

$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$

Pipette

Volumetric flask

Phenolphthalein

Pink to colourless

Increases volume required for neutralisation, reducing % error

Caustic substance