1. what is acid?
2. what is alkali?
3. What characteristics of solutions differentiate them as acidic or alkaline?
4. What is meant by pH scale? What it is used for? Give examples
(i need simple answers, so simple answers are highly appreciated)
thank you!
Answers
Answer:
(1) An acid is hydrogen containing substances that is capable of donating proton to other substances.
(2) A chemical substance that reacts with acid to form salt. It has pH value is more than 7.
(3) An acidic solution doesn't feel slimy , but it will make bubbles if you imerge metal in it.
An alkaline solution feels sleepry or slimy to touch.
(4) PH scale means (potential of hydrogen) , it is used to spacify the acidity or basicity of an aqueous solution. it is used to measure of the relative amount of free hydrogen and hydroxyl ion in water.
Hope it will help you!
An acid is a molecule or ion capable of donating a proton (hydrogen ion H+) (a Brønsted–Lowry acid), or, alternatively, capable of forming a covalent bond with an electron pair (a Lewis acid). An acid is a substance that, when added to water, increases the concentration of H+ ions in the water(Arrhenius definition). This is the standard definition of an acid.
An alkali can also be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0
General Characteristics of Acids:
pH < 7
Sour taste (though you should never use this characteristic to identify an acid in the lab)
Reacts with a metal to form hydrogen gas
Increases the H+ concentration in water
Donates H+ ions
Turns blue litmus indicator red
General Characteristics of Bases:
pH > 7
Bitter taste
Slippery feel
Increases the OH- concentration in water
Accepts OH- ions
Turns red litmus indicator blueIn chemistry, pH denoting 'potential of hydrogen' or 'power of hydrogen is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions (solutions with higher concentrations of H+ ions) are measured to have lower pH values than basic or alkaline solutions.