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المشتركون
-924 ساعات
-437 أيام
-18430 أيام
أرشيف المشاركات
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1
(1a)
Fill the table;
Volume of pipette used: 25.0 cm³
Under; Final burette reading (cm³)
(i)25.00
(ii)24.80
(iii)24.70
(iv)24.75
Under; Initial burette reading (cm³)
(i)0.00
(ii)0.00
(iii)0.00
(iv)0.00
Under; Volume of A used (cm³)
(i)25.00
(ii)24.80
(iii)24.70
(iv)24.75
(1ai)
(i)Average titre = (24.80 + 24.70 + 24.75) ÷ 3
(ii)= 24.75 cm³
(1aii)
(i)H₂X + 2NaOH → Na₂X + 2H₂O
(1bi)
(i)Mass concentration of NaOH = 4.0 g/dm³
(ii)Molar mass of NaOH = 40 g/mol
(iii)Concentration = 4.0 ÷ 40
(iv)= 0.10 mol/dm³
(1bii)
(i)Using CaVa = CbVb
(ii)Ca × 24.75 = 0.10 × 25.0
(iii)Ca = (0.10 × 25.0) ÷ 24.75
(iv)Ca = 0.101
(v)Since acid is dibasic (H₂X), divide by 2
(vi)Ca = 0.0505 mol/dm³
(1biii)
(i)Concentration of A = 0.0505 mol/dm³
(ii)Mass concentration = 4.85 g/dm³
Molar mass = 4.85 ÷ 0.0505 = 96 g/mol
(1c)
(i)Sodium hydroxide is hygroscopic (yana sha danshi daga iska)
(ii)It absorbs carbon dioxide (CO₂) from air forming sodium carbonate
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