mól dm (b) After carrying out the titration in (a), the student left the resulting solution to crystallise. White crystals were formed, with a formula of Na2S04°x H20 and a molar mass of 322.1 g mol. 3:3.1. (1) What term is given to the x H2O' part of the formula? (ii) Using the molar mass of the crystals, calculate the value of x.

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Just b (i-ii)
12.
A student carries out a titration to find the concentration of some sulfuric acid.
(a)
The student finds that 25.00 cm°of 0.0880 mol dm aqueous sodium
hydroxide, NaOH, is neutralised by 17.60 cm°of dilute sulfuric acid,
H2SO4.
-3
H2SO(aq) + 2NaOH(aq) → Na2SO,(aq) + 2H2O(1)
(1)
Vome o8 NaoH= 7S ,00 em-
Molarity of NaoHe O,0880 mol dm-3
Volume of M28043 17,60 cvnd
moles =
Calculate the amount, in moles, of NaOH used.
25,00dm
1000
molority y rolume
0.0880X2025
answer = .2.NQ022 mol
(ii)
Determine the amount, in moles, of H2SO4 used.
0.0011
O10022
answer =
mol
(iii) Calculate the concentration, in mol dm, of the sulfuric acid.
concantratio
noles
VoIUme
%3D
0,0011
0.0176
(29675
answer =
mol dm3
(b) After carrying out the titration in (a), the student left the resulting solution to
crystallise. White crystals were formed, with a formula of Na2S04°x H20
and a molar mass of 322.1 g mol.
(1)
What term is given to the x H2O' part of the formula?
(ii)
Using the molar mass of the crystals, calculate the value of x.
answer =
Transcribed Image Text:12. A student carries out a titration to find the concentration of some sulfuric acid. (a) The student finds that 25.00 cm°of 0.0880 mol dm aqueous sodium hydroxide, NaOH, is neutralised by 17.60 cm°of dilute sulfuric acid, H2SO4. -3 H2SO(aq) + 2NaOH(aq) → Na2SO,(aq) + 2H2O(1) (1) Vome o8 NaoH= 7S ,00 em- Molarity of NaoHe O,0880 mol dm-3 Volume of M28043 17,60 cvnd moles = Calculate the amount, in moles, of NaOH used. 25,00dm 1000 molority y rolume 0.0880X2025 answer = .2.NQ022 mol (ii) Determine the amount, in moles, of H2SO4 used. 0.0011 O10022 answer = mol (iii) Calculate the concentration, in mol dm, of the sulfuric acid. concantratio noles VoIUme %3D 0,0011 0.0176 (29675 answer = mol dm3 (b) After carrying out the titration in (a), the student left the resulting solution to crystallise. White crystals were formed, with a formula of Na2S04°x H20 and a molar mass of 322.1 g mol. (1) What term is given to the x H2O' part of the formula? (ii) Using the molar mass of the crystals, calculate the value of x. answer =
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