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Assignment 1 unit 19 btec science extended diploma

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This includes: P1, M1, D1 Task 1 A, Standard solution of KHP and titration of KHP with sodium hydroxide B, An acid - base titration -Questions on worksheet C, Experiment 3: titration of diluted vinegar against sodium hydroxide Task 2 A, Research primary and secondary standard Solutions, g...

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  • May 8, 2019
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Task 1 P1 a. Exp 1


Standard solution of KHP and titration of KHP with sodium hydroxide



Burette solution Sodium hydroxide (NaOH) [0.1]

Pipette solution Potassium Hydrogen Phthalate (KhP)

Indicator Penolphatein


Trial 1 2 3 4
Final 24,00 48,45 24,00 48,40 24,00
Burette Initial 0 24,00 0 24,00 0
Readings
(cm3) Difference 24,00 24,00 0 24,00 24,00
Mean titrate (cm3) 24.2

Calculations:
Concentration of potassium hydrogen phthalate (KHP)

Word equation:
Potassium hydrogen phthalate + sodium hydroxide →Potassium sodium phthalate
+ water

Molecular equation:
KHC8H4O4(aq) + NaOH →KNaC8H4O4 + H2O
Molar mass of KHP (Mr) = 39 + (12x8) + 5 + (16x4) = 204
Mass of boat + KHP = 4.87 g
Mass of boat after transfer: 0.86 g

Mass of KHP transferred (m) : 4.87 - 0.86 = 4.01 g
Moles of KHP: (n = m/Mr) 4.01 ፥ 204 = 0.0197 mol to 3 sf


Volume of solution in volumetric flask (v) : 250 ፥ 1000 = 0.25 dm-3


Concentration of KHP solution: (C = n/V) 0.0197 ፥ 0.25 = 0.0788 mol dm-3
= 0.1 mol dm-3 to 1 d.p

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