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Abdulrazak umar Usman
Questions (125)
question 7 and 8.
7. To prepare 500~cm^{3} of 0.15 mol/dm³ sulphuric acid from a stock solution of 2.0~mol/dm^{3} sulphuric
1 answer
78 views
Question 7 to 8
7. To prepare 500~cm^{3} of 0.15 mol/dm³ sulphuric acid from a stock solution of 2.0~mol/dm^{3} sulphuric acid.
1 answer
89 views
Question 6. Adding water to a concentrated solution: (i) changes the concentration of the solution (ii) does not change the
1 answer
58 views
Use the following information to answer question 12-15
Solution A is 0.1mol/dm² HCI and solution B contains 5g of Impure NaOH in
1 answer
71 views
In an experiment
Volume cold water to determine the heat of solution of a substance, the following information was obtained. of
1 answer
90 views
The heat evolved or absorbed when a substance is dissolved in a solvent to form a solution is (A
1 answer
60 views
if a substance dissolves in coexistence layers of two immiscible solvents at a specified temperature, the concentration of the
1 answer
81 views
Exothermic processes;
1 answer
54 views
Heat lost by evaporation during the determination of heat of neutralization can be reduced by
1 answer
65 views
Formation of hotspots arises during experiment to determine the heat of neutralization of strong acid and strong base due to
1 answer
80 views
Weak organic acids or bases that change colour depending on pH of a solution are called
1 answer
88 views
The heat of neutralization between a strong acid and a strong base is a constant. This is because;
1 answer
82 views
The pH of a solution is 5. What is the pOH of the solution?
1 answer
46 views
A solution which resists changes in pH is called a
1 answer
48 views
pH of a solution is expressed mathematically as
1 answer
55 views
The number of replaceable hydrogen ion in a solution is referred to as
1 answer
61 views
What is the molarity of Sodium hydroxide solution containing 60 g NaOH in 500 cm³?
1 answer
58 views
Step 1 of preparing a standard solution is
1 answer
57 views
A solution of sulphuric acid has a concentration 0.5~mol/din^{3} how many moles are present in 25cm^{3}
1 answer
57 views
Sodium hydroxide (NaOH) solution was added drop wise to a portion of an unknown sample, formation of dirty
white precipitate
1 answer
84 views
An unknown sample was acidified with dil. HCl tard, and barium chloride was added. A white precipitate, insoluble
in excess
1 answer
78 views
An unknown sample was acidified with dil. HCl tard, and barium chloride was added. A white precipitate, insoluble
in excess HCI)
1 answer
70 views
Solution A is 0.1mol/dm² HCI and solution B contains 5g of Impure NaOH in one liter. The average volume of acid
used to
1 answer
87 views
What will be the new concentration of phosphoric acid, when 20~cm^{3} of 12M phosphoric acid is diluted to 0.5 L
1 answer
64 views
calculate the volume of concentrated nitric acid, if 18 moldm-³ is required to prepare 2.0 moldm-³ nitric acid
1 answer
77 views
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