Acids & Metal Reactions Flashcards
Taste of acids
Acids are not to be eaten or tasted because they are corrosive, specially laboratory ones. These are some exceptions: lemons, vinegar, coke, etc… If you eat some of these they will taste sour.
Household acids
Lemons, oranges, pineapple, vinegar, coke, Fanta, soda, piquels
Laboratory acids
Sulphuric acid, hydrochloric acid, nitric acid
Why are some acids more dangerous than others?
Some acids like the ones found in a laboratory or a car battery are very dangerous(too dangerous to taste or touch). They are corrosive. Some acids are more concentrated or more powerful than others.
What are alkalis?
Alkalis are another group of chemicals, they are the opposite of acids. Some acids like those in the laboratory or in cleaning materials such as toilet cleaner, are too dangerous to touch. They are caustic. This is why you wear cleaning gloves.
Household alkalis
Toothpaste, detergent, champion, dish washer
Laboratory alkalis
Sodium hydroxide dil, amnonium hydroxide dil
What is an indicator?
A dye which changes colour depending on wether it’s an acid or an alkali. UI(universal indicator) is a mixture of dyes. Scientists use it in the lab to tell how alkaline or acidic a solution.
What is a neutral solution
A neutral solution is made when you mix an acid and an alkali of the same strength/power.
What does the pH scale measure
How strong or weak an acid or an alkali is. It can also be neutral
Two ways of measuring the pH of a chemical
- by its colour(which you then compare to the pH scale(if its an acid the lower the pH the stronger and if its an alkali the higher the pH the stronger))
- by the number on top of the lid
Strong acid
1-3
Weak acid
4-6
Neutral
7
What is meant by neutralisation
Acid + alkali = salt +water
