Acids, Bases and salts by Sherry sherry khan https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj Did someone mix your acid with your base because you're a bit salty today! en-us 2017-11-04 23:23:11 UTC 2023-02-17 18:08:15 UTC hello@padlet.com Measuring pH biologyandchemistrybysherry https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203579037 pH is a measurement of how acidic or alkaline (basic) a substance is.  A pH scale is used to measure how acidic or basic a liquid is. pH is a number from 0 to 14. From 0 to 7 are acids, with 0 being the strongest. From 7 to 14 are bases with 14 being the strongest base. If a liquid has a pH of 7, it's neutral. This would be something like distilled water.

An indicator can also be used to determine whether a substance is acidic or basicAn indicator is a chemical which is one colour in an acidic solution and another color in an alkaline solution.
 

 
]]> 2017-11-04 23:26:15 UTC https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203579037 Acids biologyandchemistrybysherry https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203579452 An acid is a substance which contains replaceable hydrogen atoms, and when added to water dissociates into hydrogen ions.
 
Acid + water ———> hydrogen ions.
A strong acid is one which gives up its hydrogen atoms readily and easily when added to water. i.e a strong acid undergoes full dissociation into H+ ions when added to water.     Examples of strong  acids:
Hydrochloric acid- HCl- found in the stomach
Nitric acid- HNO3
Sulphuric acid- H2SO4 Carbonic acid- H2CO3
Phosphoric acid- H3PO4   

A weak acid is one undergoes partial dissociation with H+ ions when added to water. 
Weak acid + water ® partial dissociation producing small amounts of H+ ions.
 Example: 
(vinegar) Ethanoic acid- CH3COOH Properties of acids:
1.     They have a sour taste
2.     They are corrosive
3.     They turn blue litmus paper red
4.     Acids produce an effervescent reaction when added to a carbonate
5.     Acids react with metals to produce hydrogen gas
6.     Acids react with reactive metals to produce a salt and hydrogen gas
7.     Acids react with Metal oxide (bases) to form salt and water
8.     Acids reacts with metal hydroxides to form salt and water
9.     Acids reacts with metal carbonate to form a salt, carbon dioxide and water.

]]> 2017-11-04 23:37:07 UTC https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203579452 Salts biologyandchemistrybysherry https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203579753 Salts
 A salt is a compound formed when the replaceable hydrogen atoms of an acid are replaced by metal atoms.
 
To obtain the formula of a salt follow these steps.
1.     Replace the hydrogen of the acid by the metal atom
2.     Using valency balance the formula of the salt
Example: Mg (s) + H2SO4  ——> MgSO4 (aq)
    2    2
Mg    SO4

There are two types of salts: normal salts and acidic salts
]]> 2017-11-04 23:44:04 UTC https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203579753 | Acids, Bases, and Salts biologyandchemistrybysherry https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203580177
     
]]> 2017-11-04 23:53:25 UTC https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203580177 Bases biologyandchemistrybysherry https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203580494 A base is an oxide or hydroxide of a metal
 
Most bases are insoluble in water. Bases which are soluble in water is called an alkali.  
Examples of alkalis
NaOH
Na2O
ZnO
Ag2O                                                                                 
CaO
Al(OH)3
KOH
LiOH
Pb(OH)2
 
Properties of alkalis
1.     They turn red litmus paper blue
2.     They have a bitter taste
3.     They feel soapy
4.     They react with acid to produce a salt and water as the only products.
Acid (aq) + Alkali  (aq) ®salt ( aq)and water (l)
 
]]> 2017-11-05 00:01:18 UTC https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203580494 ICT applicability biologyandchemistrybysherry https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203581397 Short notes are used to highlight important points, videos used to explain the use of these substances in everyday life, thereby bringing to life the concepts. A crossword puzzle is used as an assessment for learning tool at the end of the lesson. it evaluates students learning in a different format. ]]> 2017-11-05 00:26:27 UTC https://padlet.com/biologyandchemistrybysherry/tujb61msxrnj/wish/203581397