16 dent prepares a solution of sodium sulfate, Na So., by adding 6.25 x 10 2 mol dm sulturic acid, H,SO,, from a burette to 25 Ocm of 0.124 mol dm 3 NaOH in a conical lask. 2NAOH(aq) + H,SO,(aq) - Na,so.(aq) + 2H,0(1) Calculate the minimum volume of the H.SO, that the student would need to completely react with the NaOH present. volume of H,SO = cm3 .........
16 dent prepares a solution of sodium sulfate, Na So., by adding 6.25 x 10 2 mol dm sulturic acid, H,SO,, from a burette to 25 Ocm of 0.124 mol dm 3 NaOH in a conical lask. 2NAOH(aq) + H,SO,(aq) - Na,so.(aq) + 2H,0(1) Calculate the minimum volume of the H.SO, that the student would need to completely react with the NaOH present. volume of H,SO = cm3 .........
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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I submitted previous answers to other questions 8n order to answers C.
Transcribed Image Text:(c) A student prepares a solution of sodium sulfate, Na„SO,, by adding 6.25 × 10 Moram
sulturic acid, H,SO,, from a burette to 25 Ocm of 0.124 mol dm-3 NaOH in a conical flask.
2NAOH(aq) + H,SO,(aq) Na, so̟(aq) + 2H,0(1)
vat ulate the minimum volume of the H.SO, that the student would need to completely react
with the NaOH present.
volume of H,So̟ =
cm3
Transcribed Image Text:12.
(b) A student knew that calcium hydrocide could be made by adding calcium to water.
The student added 0.00131 mol of calcium to a beaker containing about 100cm of water.
A reaction took place as shown by the equation below.
All the calcium hydroxide formed was soluble.
Ca(s) + 2H,0(1) → Ca(OH))z(aq) + H2(g)
(1) Calculate the mass of calcium that the student added.
mass of 1 mole
mass of 0.00131 moles of caloum y0x0.ool31
of calclum=
Imod
bon-
mass of calcium = Q 05 24
(H) Calculate the volume of hydrogen gas, in dm2, produced in this reaction at room
temperature and pressure, RTP.
1mol of Ca sives Imol of Hz
9.00131molof co, sives 0100131 Mol of Mz
At RTR
P-latm
T 298K
R= 0. 081
atmc
VE hRi, 0.0013I molx o10821 dn X298K00,032
Tatm
volume of hydrogen gas =
dm3
nolik
12=1 d oi321 0.032dm
(ii) The student 'transferred the contents of the beaker to a 250 cm3 volumetric flask and
water was added to make the solution up to 250 cm³.
Calculate the concentration, in mol dm3, of hydroxxide ions in the 250 cm solution.
Imd of ca gives Imd of CaoH).
0.00131 Mol of ca gives o.00131nol of Ca COM2
numberof noles of Ca Co02
- 0.00131 moles
24
Ca (ol4 > Catloi concentration =
mol dm3
2mole
zmoles of hydroxide
ions,
Imole of ca(OH) sives zmoles of hydrovide
humber of hydroxite ions= 2x 0,00131 moles
0,00262 moley
0,00 262 moles
Z5o x lo3
(oncenfration of nydroxide -
0,01048 mol dn
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