-396240-181610005933440-43116500Access to Higher Education
-396240-181610005933440-43116500Access to Higher Education
Assignment submission details
Unit title: Reacting amounts
Assessor name: Mohammed Ibrahim / Gulshan Firdos
Please complete all sections in yellow in order to have the grade confirmed
Students complete the sections in yellow before submitting:
Students Name:
Learner Declaration: I can confirm that, apart from correctly referenced quotations, this assignment is my own work and contains no plagiarised content. All sources have been acknowledged and referenced.
Student Signature: Date:
Grading Information for this Assignment
Grade Descriptor: 1: Understanding of the Subject
For a Merit your work or performance must: demonstrate a very good grasp of the relevant knowledge base
For a Distinction your work or performance must: demonstrate an excellent grasp of the relevant knowledge base
Learner Guidance notes: Show your working where possible, on the exam paper. Achievement of all the assessment criteria is required before a grade can be awarded. To meet the criterion, at least half of the question must be correct. A completely new resit paper will be issued if none of the assessment criteria is achieved on the first submission. If one or more assessment criteria are not met on the first submission, a re-submission of the specific assessment criteria will be required before grading the assignment.
Grade Descriptor: 3: Application of Skills
For a Merit your work or performance must be to: generally select appropriate methods and apply them with a very good degree of accuracy.
Demonstrate very good skills in both following the acid-base titration experiments video links to complete the relevant calculations associated with the videos and all other numerical questions in the assignment.
For a Distinction your work or performance must be to: consistently select appropriate methods and apply them with excellent levels of accuracy. Demonstrate excellent skills in both following the acid-base titration experiments video links to complete the relevant calculations associated with the videos and all other numerical questions in the assignment. Concordant values must be identified and used correctly as instructed.
Learner Guidance notes: Show skilful completion of the acid-base titration calculations as set out in both the video links and instruction sheet in the assignment. Work completed to the required standard indicates distinction level of skill.
Grade Descriptor: 7: Quality
For a Merit your work or performance must:
Structure the work in a way that is generally logical and fluent, and also taken as a whole demonstrates a very good response to the demands of the assessment.
For a Distinction your work or performance must:
Structure the work in a way that is generally logical and fluent, and also taken as a whole demonstrates an excellent response to the demands of the assessment.
Learner Guidance notes:
Be clear and unambiguous in your answers. In calculations, show all working where possible and give numerical responses to correct number of decimal places (2 decimal places, except for Ar and Mr or 3 significant figures) and include units where appropriate. Numerical answers should be given with correct units used (amount = mols, mass = g / kg, volume = cm3 / dm3, concentration moldm-3/ gdm-3 or consistent with those used in the question). Demonstrate skill in identifying and using in calculations titration (titre) values within concordancy, for distinction.
***Students - Insert your completed assignment here***
Answer all the questions in the spaces provided
1.1
Q1
(a)Balance the following equations:
(i)C3H7OH+ O2H2O+CO2
(ii)PCl3+H2OH3PO3+HCl
(iii)NH3 +O2H2O + NO
(iv)Fe2O3+CO Fe+CO2
(b) Write the formula equations from the word equations given below and balance them:
Nitrogen gas+Hydrogen gas Ammonia gas (Nitrogen trihydride)
Hydrogen gas+ Oxygen gasWater(Dihydrogen oxide)
Carbon monoxide gas +Oxygen gascarbon dioxide
Sulphur dioxide gas +Oxygen gasSulphur trioxide 1.2Q2 Calculate Mr for each of the following:
(NH4)2SO4
Mg3N2
H3PO3
CuSO4.5H2O
C6H12O6
Ca(CN)2 (vii) Na2H2P2O7 (viii) Na2CO3.10H2O 1.3Q3(a)Work out the number of moles of:
0.4 g of NaOH
1.4 g of nitrogen molecule
54 g of water molecule (H2O)
3103 g of Ca3(PO4)2 (b)Work out the mass of:
0.1 moles of Copper (II) sulphate (CuSO4)
5 moles of hydrogen molecule
0.1 mole of sodium atoms
0.5 mole of calcium carbonate (CaCO3) 1.4Q4
Use the balanced equation given below to calculate the mass of sodium oxide formed when 4.6 g of sodium burns in excess oxygen:(4Na +O22Na2O) (b) What is the maximum amount of aluminium in grammes that can be produced from 51 g of aluminium oxide (Al2O3) in the following reaction process: 2Al2O3 4Al +3O2 ? 1.5Q5(a) 5.00 g of sodium hydroxide are placed in a volumetric flask and the solution made up to 100 cm3 with water. What is the concentration of the solution in moles per cubic decimetre (moldm-3)? (b) What volume of 0.10 moldm-3 sulphuric acid would be required to neutralise a mixture of 1.06 g of anhydrous sodium carbonate and 4.00 g of sodium hydroxide? (H2SO4 + 2NaOH Na2SO4 + 2H2O) and (H2SO4 + Na2CO3 Na2SO4+ H2O + CO2) (i) Calculate the number of moles in 4.00 g of NaOH (ii) Calculate the number of moles in 1.06 g of Na2CO3 (iii) Calculate the number of moles of H2SO4 that neutralised the mixture (iv) Calculate the volume of H2SO4 that neutralised the mixture AC 2.1Follow instructions to perform a simple acid base titration competently and safely Your tasks TASK 1: Watch the following video link which gives the step-wise procedure for carrying out an acid-base titration in order to understand better how a titration experiment is carried out: https://youtu.be/Y-5QJIr7Xm4?t=13 TASK 2: Practice your titrations using the RSC titration simulation at Titration screen experiment (rsc.org) From the main screen, click register. This will generate a random number that is unique to you. You can login as many times as you need to with this number. Keep it safe or you will have to start again!Work through the simulation till you get to the end of titration level 1. This will help you to understand what happens during titration and what is happening chemically. Once you have completed the sections, download the lab book and attach it to your submission (there will be two parts to submit, part 1 is the assignment and part 2 is the simulation). You are required to complete only the Titration Level 1 activities.Click on the lab book at the bottom of the page. Download the pdf of the completed lab book. Your initials will be in the corner of the book so that you can identify the work as your own. AC 2.2Perform calculations based on results of titrations to obtain a valid result. (a) Suppose you carried out a titration experiment in which you recorded an average volume of 26 cm3 of dilute hydrochloric acid (HCl) by titration with 0.05 moldm-3 and 25 cm3 of potassium hydroxide (KOH). Calculate the concentration of the hydrochloric acid. Write a balanced formula equation using the word equation given below, for the reaction: hydrochloric acid+ potassium hydroxide potassium chloride +water Equation: .+.. + . (b) Suppose the laboratory Technician carried out the same titration experiment in which he/she recorded an average volume of 24.5 cm3 of the dilute hydrochloric acid (HCl) by titrating with 0.05 mol dm-3 and 25 cm3 of potassium hydroxide (KOH). Calculate the concentration of hydrochloric acid from the Technicians experiment. Write a balanced formula equation using the word equation given below, for the reaction: hydrochloric acid+ potassium hydroxide potassium chloride +water Equation: +. + Summary of steps involved in the above calculation of the concentration of the acid solution:
Complete a balanced equation for the reaction.
Calculate the amount (moles) of potassium hydroxide in 25.00 cm3.
Use this to find the amount (moles) of acid used to react with the potassium hydroxide
Calculate the concentration of the acid using the amount (moles) of acid and the average of your concordant results.
AC 2.3
Analyse the results of an acid base titration & review the method used.
1. Subtract the concentration of hydrochloric acid obtained using your results in (a) above from the concentration obtained using the Technicians results in (b) above:
2. Compare the two values of concentration of the acid and calculate the percentage difference between them using the relationship below:
% difference = difference between 2 concentration values x 100
Technicians concentration value
3. Calculate systematic (apparatus) error.
% Error = error of equipment x 100
amount measured
Standard errors in apparatus are as follows:
25.0 cm3 pipette: 0.06 cm3
Burette (use 24 cm3): 0.1 cm3
4. Total Apparatus Error = sum of individual errors from both pipette and burette
5. Random error = % difference total apparatus error
6. Comment on the accuracy of your work in terms of random (human) and systematic (apparatus) errors. Comment on the % difference and suggest reasons that might explain it. Consider why your result might be higher/lower than the Technicians result. Think of the measurements made and comment on anything that might have influenced the readings taken. (Use the experience from both your RSC simulation experiment and the video link experiment watched above in order to answer this section).
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Assignment feedback details
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Unit Title: Reacting amounts
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First Submission Second Submission Referral
1.1 Construct balanced equations 1.2 Calculate relative molecular masses 1.3 Convert mass to moles and vice versa 1.4 Calculate reacting masses from given equations. 1.5 Calculate volumes and concentrations in acid base reactions. 2.1 Follow instructions to perform a simple acid-base titration competently and safely. 2.2 Perform calculations to obtain a valid result. 2.3 Analyse results and review the experimental method. Tutor Signature: Date:
Eligible for Grading? Yes / No
Feedforward against Grade Descriptors (see grading rubric for feedback) Grade
1. Understanding of the subject:
3. Application of skills:
7. Quality:
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