Study resources on Kenyaplex

Get ready-made curriculum aligned revision materials

Exam papers, notes, holiday assignments and topical questions – all aligned to the Kenyan curriculum.

Browse exam papers

Or go directly to:

Class notes Holiday assignments Topical questions Other resources

Describe how you would prepare crystals of sodium nitrate starting with 200cm³ of 2M sodium hydroxide.

Describe how you would prepare crystals of sodium nitrate starting with 200cm³ of 2M
sodium hydroxide.

Answers

- Mix /react/ add 200cm³ of 2M HNO₃ with 200cm³ of 2M NaOH to obtain
NaNO₃ solution.
- Heat the mixture until crystals of NaNO₃ start to form
- Cool to obtain more crystals of NaNO₃ and dry between filter papers.

sharon kalunda answered the question on May 13, 2019 at 13:31

Answer Attachments

Next: The following table gives the melting points of oxides of elements in period 3. Study it and answer the questions that follow:-

Previous: During the extraction of lead from its ores one of the main ore used is Galena

View more Chemistry Questions and Answers | Return to Questions Index

Exams With Marking Schemes

Related Questions

The following table gives the melting points of oxides of elements in period 3. Study it and answer the questions that follow:- (Solved)

The following table gives the melting points of oxides of elements in period 3. Study it and
answer the questions that follow:-

(i) Explain the difference in melting points of MgO and P₄O₁₀
(ii) Name the compound in the above table that will dissolve both in dilute
hydrochloride acid and dilute sodium hydroxide.

Date posted: May 13, 2019 . Answers (1)
36cm³ of a solution of potassium hydroxide requires 25cm³ of 0.5M sulphuric acid to neutralize it.Calculate the concentration of alkali in g/dm³ (Solved)

36cm³ of a solution of potassium hydroxide requires 25cm³ of 0.5M sulphuric acid to
neutralize it.Calculate the concentration of alkali in g/dm³

Date posted: May 13, 2019 . Answers (1)
The diagram below represents set-up that can be used to prepare and collect oxygen gas (Solved)

The diagram below represents set-up that can be used to prepare and collect oxygen gas

a) Name solid P
b) What property of oxygen makes it possible for its collection as indicated by the
diagram.
c) Explain why it is important not to collect any gas for the first few seconds of the
experiment.

Date posted: May 13, 2019 . Answers (1)
During the electrolysis of dilute sulphuric (VI) acid the volume of hydrogen gas collected is twice the volume of oxygen gas. Using half equations justify the... (Solved)

During the electrolysis of dilute sulphuric (VI) acid the volume of hydrogen gas collected is twice
the volume of oxygen gas. Using half equations justify the above statement.

Date posted: May 13, 2019 . Answers (1)
Under certain conditions ,methane reacts with steam to form carbon (II) oxide and hydrogen only. Calculate the total volume of the gas that can be... (Solved)

Under certain conditions ,methane reacts with steam to form carbon (II) oxide and hydrogen only. Calculate the total volume of the gas that can be formed when 100cm³ of steam reacts completely with methane.

Calculate the enthalpy change of the reaction.

Date posted: May 13, 2019 . Answers (1)
Using a suitable equation explain why it is not advisable to use hardwater in hot water systems. (Solved)

Using a suitable equation explain why it is not advisable to use hardwater in hot water
systems.

Date posted: May 13, 2019 . Answers (1)
The catalytic oxidation of ammonia gas is done as per the set up below. (Solved)

The catalytic oxidation of ammonia gas is done as per the set up below.

a) Name the catalyst used in the above reaction.
b) After sometime, brown fumes are formed in the flask. Explain briefly how this
observation occurs.
c) Why does the metal catalyst stay red hot for some time?

Date posted: May 13, 2019 . Answers (1)
Hydrogen gas is one of the lightest gas known but has not lived to its expectation to be used inObservation balloons. Explain (Solved)

Hydrogen gas is one of the lightest gas known but has not lived to its expectation to be used inObservation balloons. Explain

Date posted: May 13, 2019 . Answers (1)
Describe how you would prepare a sample of iron(II)carbonate,starting with iron metal and dilute hydrochloric acid. (Solved)

Describe how you would prepare a sample of iron(II)carbonate,starting with iron metal and dilute hydrochloric acid.

Date posted: May 13, 2019 . Answers (1)
When 1.15g of R were reacted with water, 600cm³ of gas was produced. Determine the relative atomic mass of R. (Molar gas volume = 24 000... (Solved)

When 1.15g of R were reacted with water, 600cm³ of gas was produced.
Determine the relative atomic mass of R. (Molar gas volume = 24 000 cm³).

Date posted: May 7, 2019 . Answers (1)
60 cm³ of oxygen gas diffused through a porous partition in 50 seconds. How long would it take 60cm³ of sulphur (IV) oxide gas to diffuse through... (Solved)

60 cm³ of oxygen gas diffused through a porous partition in 50
seconds. How long would it take 60cm³ of sulphur (IV) oxide gas to diffuse
through the same partition under the same conditions? (S = 32.0, 0 = 16.0)

Date posted: May 7, 2019 . Answers (1)
When 8.53g of sodium nitrate were heated in an open test-tube, the mass of oxygen gas produced was 0.83 g . Given the equation of the reaction... (Solved)

When 8.53g of sodium nitrate were heated in an open test-tube, the
mass of oxygen gas produced was 0.83 g . Given the equation of the
reaction as 2NaNO 3 (s) -> 2NaNO 2 (s) + O 2 (g)
Calculate the percentage of sodium nitrate that was converted to sodium
nitrite. (Na = 23.0, N = 14.0, O = 16.0)

Date posted: May 7, 2019 . Answers (1)
A label on a bottle of hydrochloric acid has the following information: Density 1.134g/cm^3,percentage purity 37% .Determine the molarity of the solution (Solved)

A label on a bottle of hydrochloric acid has the following information: Density 1.134g/cm^3,percentage purity 37%. Determine the molarity of the solution

Date posted: May 1, 2019 . Answers (1)
Explain Ammonia as a reducing agent. (Solved)

Explain Ammonia as a reducing agent.

Date posted: April 30, 2019 . Answers (1)
Explain the reaction of ammonia with air in the presence of platinum wire. (Solved)

Explain the reaction of ammonia with air in the presence of platinum wire.

Date posted: April 30, 2019 . Answers (1)
Describe the Qualitative analysis for cations using sodium hydroxide solution. (Solved)

Describe the Qualitative analysis for cations using sodium hydroxide solution.

Date posted: April 30, 2019 . Answers (1)
Explain the effects of heat on concentrated nitric acid. (Solved)

Explain the effects of heat on concentrated nitric acid.

Date posted: April 30, 2019 . Answers (1)
Explain the reaction of nitric acid with saw dust. (Solved)

Explain the reaction of nitric acid with saw dust.

Date posted: April 30, 2019 . Answers (1)
Describe the Ostwald’s process. (Solved)

Describe the Ostwald’s process.

Date posted: April 30, 2019 . Answers (1)
Describe the Laboratory preparation of sulphur (IV) oxide. (Solved)

Describe the Laboratory preparation of sulphur (IV) oxide.

Date posted: April 29, 2019 . Answers (1)