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Summary All Criteria BTEC Level 3 Unit 2 Assignment 1
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Practical Scientific Procedures and Techniques All criteria covered and Distinction received.
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Moreen Mero Unit 2 Assignment 1Calibration of measuring instruments
Calibration of a balance: the balance equipment is used in the lab to weigh substances that used in experiment. we calibrate the balance to ensure
the level of the accuracy that we require for the experiment, and to make sure that the balancing equipment is accurate and precise, because if it is
not, and any false changes in the weighting, it will affect the precision on our experiment. To calibrate the electric top pan balance; first, the
balancing equipment should be placed in a steady place, not on leaning surfaces. Checking the level of the balance, and the cleanness of the pan
is important, wearing gloves, to avoid the dust from the hands. The sizes of the calibration masses for electric balance that are used are 300 g &
200 g, we need them to check the precision and accuracy in the weighting of the balance.
Calibration of a pipette: the graduated pipette is a lab equipment, that is used to transfer, and measure small amounts of liquid volumes. Precision
and accuracy are very important in the measurements of the pipette when doing experiments in the lab, any inconsistency and inaccuracy, would
affect the result of the experiment, that is why calibration is important. To check the calibrate the pipette; we prepare the pipette by wiping it with
a clean material, to remove any remaining contaminants in it. we weight an empty dry beaker and record its mass to 2 decimal places. Then we
transfer 25 cm3 of distilled water to that beaker, using the graduated pipette, and a pipette filler. We reweight the beaker with the water that been
transferred, and record its mass again. After that, we empty the beaker, and dry it with a paper. We repeat this process more than 3 times, to
calculate an average of the results we will have. The water temperature and the density is been gives in the results table, and to use it in the
calculations.
, Moreen Mero Unit 2 Assignment 1
Titrations using indicators
Preparation of the standard solution of sodium carbonate
The aim of this experiment is to make a standard solution of sodium carbonate, that it will be used in a titration experiment.
Preparation: standard solution was made by weighing between 1.2 – 1.4g of sodium carbonate on a watch glass, on the top pan balance after re-
zeroing the balance, we then record the mass of the anhydrous sodium carbonate to 2 decimal places. After that we pour the sodium carbonate into
a 250 cm3 beaker, and fill it with 100 cm3 of distilled water, we stir the sodium carbonate with glass rod so it dissolves in water, and then pour the
solution in 250 cm3 volumetric flask, by using a glass funnel. Then we fill the flask with distilled water until the meniscus bottom of the solution
will rest on the graduation line, we mix the solution by inverting the flask, finally we label it with the name of the solution, the mass we weighted,
our personal names and date.
The risk assessment of this experiment: safety roles of covid-19, 2 metres distance must apply, cleaning and washing hands, wearing eye
protection, lab coat, and masks when required. The sodium carbonate does not have any specific hazard.
Results table of amount of sodium carbonate weighed out:
mass of anhydrous sodium carbonate/g 1.30
initial mass/g 0.00
mass of anhydrous sodium carbonate used/g 1.30
, Moreen Mero Unit 2 Assignment 1
CALCULATION OF THE STANDARD SOLUTION MOLARITY:
Weighted 1.30 g of anhydrous sodium carbonate (Na2CO3) which Dissolved in 250 cm3 water. The Relative atomic mass:
sodium = 23(2)
carbon = 12
oxygen = 16(3)
the formula mass = 23 + 23 + 12 + 16 + 16 +16 = 106
turn the mass into moles = 1. = 0.0122641 moles of sodium carbonate
turn the moles dissolved into molarity = molarity = moles x 1000/250
= 0.0122641 x 1000 /250 = 0.0490564 mol dm-3
The Molarity of Standard Sodium Carbonate solution = 0.0491 mol dm-3
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