About Acid or Base?
Acid or Base? is a kitchen chemistry lab on the pH scale, which runs from 0 to 14 with 7 as neutral. Sort lemon juice, vinegar, cola, coffee, pure water, salt water, baking soda, soapy water and household ammonia into acids, neutral and bases, using typical values such as lemon juice about 2, vinegar about 3 and baking soda in water about 8.
Red cabbage juice is a natural indicator: guess its colour before you pour, then watch it turn red or pink in acids, stay purple near neutral, and go blue, green and yellow in bases. Put liquids in order on the scale, and find out why lemon juice is about a thousand times more acidic than black coffee: each pH step is ten times stronger.
In Neutralise you add base to an acid, a big squirt or a single drop at a time, and watch the pH sit low and then jump right at the end. Safety first is clear and simple: never taste lab liquids or cleaning products, never mix cleaning products (bleach with ammonia or vinegar makes poisonous gas), and if a chemical gets in an eye, rinse with clean water for at least 15 minutes and get a grown-up to call for help.
Best for ages 9+
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