Question

Q3. (a)

(b)
(c)
Emma used a burette to measure a volume of aqueous copper sulfate (CuSO4 (aq)). What
should she record as her burette reading?
19
The burette reading is 19.00 cm³.
The burette reading is 20.00 cm³.
The burette reading is 21.00 cm³.
Aqueous copper sulfate
Answer:
You are required to measure accurately a volume of 25.00 cm³.
(i)
Identify the piece of glassware that will most accurately measure a volume of
25.00 cm³ from the following list; a 150 cm³ measuring cylinder, a 25 cm³ pipette,
and a 50 cm³ burette.
(ii) Explain your reason.
Relative Molecular Mass (RMM) of
KOH
(2 marks)
Potassium hydroxide reacts completely with sulfuric acid according to the equation:
H₂SO4(aq) + 2KOH(aq)
K₂SO4(aq) + 2H₂O(1)
0.65 g of potassium hydroxide were dissolved in water and made up to 250 cm³ of
solution. 25 cm³ samples of this solution were titrated against sulfuric acid (H₂SO4)
solution. The mean volume (titre) of sulfuric acid required for complete reaction was
15.00 cm³.
(i)
Find the molar concentration of the prepared solution of potassium hydroxide.
Complete the calculation given below:
No. of moles of KOH in 250 cm³
.. molar concentration of KOH
(Include units in your answer)
=
=
.cm³
(1 mark)
=
=
(1 mark)
(1 mark)
(1 mark)

Answer 1

All answer on the attached worksheet.

Step-by-step explanation:

See the attached worksheet. (Note that the burette marks are upside down. (Or it isn't from Earth).

It is good to recognize that Molar (M) is defined as (moles/liter).