Edexcel IGCSE Chemistry: Acids, Alkalis, and Titrations

These flashcards cover key concepts related to acids, alkalis, and titrations for the Edexcel IGCSE Chemistry course.

What color does phenolphthalein turn in alkaline solutions?

Pink

What is the color of methyl orange in acidic solutions?

Red

What color does litmus paper turn when exposed to an acidic solution?

Red

What pH range indicates a strongly acidic solution?

0-3

What indicates a neutral pH on the pH scale?

pH 7 is neutral.

How are acids described in terms of their ionization in aqueous solutions?

Acids produce H+ ions in aqueous solutions.

What does the ionic equation for an acid-alkali neutralization reaction look like?

H+(aq) + OH-(aq) -> H2O(l)

What apparatus is used to measure the volume of acid needed to neutralize an alkali in a titration?

A burette.

Why is phenolphthalein used as an indicator in titrations involving alkalis?

Because it is pink when alkaline and colorless when acidic.

What is the step that follows adding acid from the burette to the conical flask in a titration?

Stop adding acid when the end-point indicated by the color change is reached.