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Assignment 1 unit 19 btec science extended diploma

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Institution PEARSON (PEARSON)
Module Unit 19 - Practical Chemical Analysis
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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, giving examples and their industrial and/ or commercial uses; B, using the results of your research and your calculations, decide which solution is a primary standard and which is a secondary standard: C, explain the need for primary and secondary standards in analysis: Task 3 A, Reliability of method used for titrating sodium hydroxide (NaOH) against hydrochloric acid (HCL): B. calculate the % error of the experiment b, which was titration of sodium hydroxide (NaOH) against hydrochloric acid (HCL) and explain how the errors could be reduced: (THIS WILL SHOW UP IN THE MARK BOOK AS PLAGIARISM AND YOU WILL GET EXCLUDED OUT THE COURSE) THIS WORK IS MEANT TO BE AS A REFERENCE OR GUIDANCE FOR YOU'RE WORK PLEASE RESPECT MY WORK AND MAKE SURE YOU GIVE ME CREDIT OR PUT IT IN YOU'RE OWN WORDS Thanks

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11053457


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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BTEC
Subject
Applied Science 2010 QCF
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May 8, 2019
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2018/2019
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