Acids And Bases

Question 1

Acids

Answer 1

Anything dissolves in water

Acids are substances which ionize(form ions) in water to produce H+.

Strong acid, more acidic = lots of H+ ions produced
Weak acid, less acidic = not a lot of H+ ions produced

Acids are corrosive, eat away metal, wood, clothing, skin. Also have a sour test

Bacteria feed on food in your mouth, produce weak acids slowly causing teeth decay

Question 2

Bases

Answer 2

Substances produce OH- ions in water. Have a soapy feel and are bitter in taste.

If a base can dissolve in water, it is alkali or an alkaline solution.

Bases are caustic, can burn just like acids

Question 3

pH Scale

Answer 3

Measures the concentration of H+ ions in solution

From 0 to 14 tells you how acidic or basic a solution is

Acidic solutions have a pH less than 7
Basic (alkali) solutions have a pH greater than 7
pH of 7 tells the solution is neutral(at 25 degrees)

Question 4

Indicator

Answer 4

Substances that changes colour at different pH’s
Giving a quick way of determining an approximate pH of a solution

If acidic, paper turns red
If basic, paper turns blue

Question 5

Neutralisation Reaction

Answer 5

Acid + Base —> Salt + Water

Called neutralisation reaction because water is neutral, has a pH of 7

Question 6

Acids + Metal

Answer 6

Acids + Metal —> Salt + Hydrogen Gas

Question 7

Acids + Carbonates

Answer 7

Acids + Carbonates —> Carbon dioxide + water + salt