revision on acid base and salt = with answers
DESCRIPTION
Basic chemistry conceptTRANSCRIPT
![Page 1: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/1.jpg)
Chemistry revision form 5 - 2011
Topic
acid base and salt
![Page 2: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/2.jpg)
Chlorides salts
Sulphates salts
soluble salts
All soluble except
All soluble except
Insoluble salts
•a) Soluble and Insoluble salts
![Page 3: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/3.jpg)
Nitrate salts
carbonate salts
soluble salts
All soluble
Insoluble salts
All insoluble except
•a) Soluble and Insoluble salts
![Page 4: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/4.jpg)
SALT PREPARATION METHODS
SOLUBLE SALTS ( must start with )
TITRATION METHOD( reaction between and )
SOLID
AND HOT ACID METHODFor soluble salts of
salts
For all soluble salts
![Page 5: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/5.jpg)
SALT PREPARATION METHODS
INSOLUBLE SALT( the reactants must be in
form)
METHOD
![Page 6: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/6.jpg)
Excess copper (II) oxide powder
Acid xxxxxxxxxxxx
Heat
![Page 7: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/7.jpg)
State the colour of •copper (II) oxide powder
•copper(II) sulphate solution
Based on Diagram, name the acid used to prepare copper (II) sulphate.
![Page 8: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/8.jpg)
Write the chemical equation for the preparation of copper (II) sulphate.
State the reason why copper (II) oxide powder is added until in excess.
![Page 9: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/9.jpg)
Describe how to obtain pure crystals from solution of copper (II) sulphate in the beaker above.
![Page 10: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/10.jpg)
0.1 mol of copper (II) sulphate is produced from the reaction between acid and excess copper (II) oxide.Calculate the mass of copper (II) sulphate formed.
![Page 11: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/11.jpg)
Describe chemical tests to verify the present of cation in copper (II) sulphate solution.
![Page 12: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/12.jpg)
Describe chemical tests to verify the present of anion in copper (II) sulphate solution.
![Page 13: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/13.jpg)
Question 3
Preparation of salt
0.1 mol dm-3 hydrochloric acid
method of preparation of salt
Experiment 125.0 cm3 of 0.2 mol dm-3 sodium
hydroxide + phenolphthalein
Name of method:i.Titration
![Page 14: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/14.jpg)
Experiment 11
10 cm3 of 1.0 mol dm-3 lead(II) nitrate solution
Excess potassium iodide solution
Name of method:Double decomposition(precipitation)
![Page 15: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/15.jpg)
b.Experiment 1i.Name reaction Neutralization
ii.Chemical equationNaOH + HCl NaCl +H2O
![Page 16: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/16.jpg)
iii. Colour change of phenolpthalein
Pink to colourless
![Page 17: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/17.jpg)
iv. Calculate Volume of HCl needed
Mole of NaOH= 25 x 0.1/1000 =0.005
From the equation,
0.005 mol NaOH0.005 mol HCl
But mole = MV/1000
So V = mole x 1000/M
V = 0.005 x 1000/0.1
V = 50Cm3
![Page 18: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/18.jpg)
c. Experiment II
i.Name of saltLead(II) iodide
Ii. Write Ionic equation
Pb 2+ + 2I- PbI2
![Page 19: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/19.jpg)
Iii How pure salt is obtained from the reaction II?
- Filter the mixture
- Rinse residue with distilled water
- Dry between two filter papers
![Page 20: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/20.jpg)
iv. Calculate maximum mass of precipitate X
Mole of Pb(NO3)2= 10x1 /1000
= 0.01 mol
But
0.01 mole Pb 2+ 0.01 mole PbI2
So mass of PbI2 = mole x mmass
= 0.01x(207+ 2(127))g
=4.61 g
![Page 21: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/21.jpg)
Question 4Action of heat on salts
+
I. Name gas Q CARBON DIOXIDE name of COMPOUND x
Copper (ii) carbonate
Compound X
Copper (II) oxide
Gas Q∆
![Page 22: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/22.jpg)
State the colour of
COMPOUND X COPPER(II) OXIDE
GREEN
BLACK
![Page 23: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/23.jpg)
(III) Chemical equation for decomposition of compound X
CuCO3 CuO + CO2
(iv) If copper(II) nitrate is heated to replace compound X, write chemical equation
2Cu(NO3)2 2CuO+
4NO2+ O2
![Page 24: Revision on acid base and salt = with answers](https://reader033.vdocuments.us/reader033/viewer/2022061119/546a6aadaf79598c2c8b609e/html5/thumbnails/24.jpg)
thank you
"Your potential as a human being…is unlimited. You have within you the ability to become and to achieve anything you want."