Do Now Get out analysis and answers to questions from Core Practical 1.

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Presentation transcript:

Do Now Get out analysis and answers to questions from Core Practical 1

Analysis – Question 2 and 3

Amount of carbon dioxide produced (cm3) Mass of calcium carbonate (g)

Analysis – Question 4 CaCO3 + CH3COOH  (CH3COO)2Ca + CO2 + H2O Moles of CaCO3 = mass/Mr = 0.25/100.1 = 0.00250moles Therefore moles of CO2 = 0.00250moles

Questions (1-5)

How to do a titration? Preparation of Core Practical 2. What is a titrand (USA)/analyte (UK)? What is a titrant? Why do we use an indicator? Why do we use a conical flask? Why rinse your burette with small amount of titrant before starting the titration? Do you need to fill to the zero mark? How do you get rid of air bubbles? Where do you read your volume from? How many drops of indicator do you use? Why use white paper underneath the conical flask? How many hands do you use to carry out a titration? What is the first titration? What does a dark solution indicate? What is the desired end point? What should you do when flashes of colour appear in the conical flask? https://www.youtube.com/watch?v=sFpFCPTDv2w

Percentage Measure Uncertainty Each piece of apparatus you use to record a value has a measurement of uncertainty This is due to how it is manufactured and calibrated Most cases, the percentage uncertainty when you use the apparatus depends on the value you measure. It mostly depends on how many values you record with the apparatus and how big the value is compared to the capacity of the apparatus.

Percentage Uncertainty % uncertainty = actual measurement uncertainty x 100 value recorded

Percentage Uncertainty Glassware Apparatus Capacity Uncertainty Percentage Uncertainty Burette 50cm3 ±0.05cm3 ? Pipette 25cm3 ±0.06cm3 Volumetric flask 250cm3 ±0.3cm3

Balances The precision of the balance i.e. the number of decimal places to which the balance can be read The mass being weighed, as the percentage uncertainty will be greater for a smaller mass What is the percentage uncertainty when weighing 3.57g of marble chip, using a two-decimal place balance with uncertainty of ±0.005g?

What is the percentage uncertainty? Questions Mass of weighing bottle + solid = 20.354g Mass of weighing bottle = 19.816g Mass of solid = 0.538g The measurement uncertainty in a three-decimal place balance is ±0.0005g. What is the percentage uncertainty?

Exam Question