Distinction Level BTEC Applied Science Assignment A - Titration Practical - Making a standard solution.

Distinction Level BTEC Applied Science Assignment A - Titration Practical - Making a standard solution. Method on calibrating scales 1. First tare your skills and make sure that it reads 0 2. Then carefully place a standard weight in the middle of the scale 3. Wait for the scale to stop processing the scale 4. Write down your results in a table 5. Assess if your results shown on the scales correspond with the actual weight of the scales My hypotenuses All of the standard weights, I predicted, would appear on the scale at their identical weight. My results Standard weight Reading on the scale 1g 1.00 g 2g 2.00 g 3g 3.00 g 5g 5.00 g 10g 10.00 g 20g 20.05 g 30g 30.8 g 40g 40.11 g 50g 50.12 g Evaluating my results My prediction did not match my results, as you can see. I had never calibrated a scale before and was surprised to discover that my prediction was incorrect. The scales were correct up till the 5g, however it was a few decimetres heavier than it should have been. implying that the scale would be inaccurate for weights more than 5g. This might be because the school scales are old and not taken seriously by students, so they have been broken; nevertheless, if I were to use modern scientific scales, the scales would read precisely the same as the normal weight. Calibrating a 25ml pipet In order to construct my standard solution, I needed to calibrate the equipment I used, much like the scales, to ensure that the acid I used read to a precise point i had to calibrate the 25ml pipet Equipment used to calibrating a 25ml pipet  pipet  distilled water  measuring scales  beakers (x2) 50ml and 100ml  pipet pump method for calibrating a 25ml pipet 1. weight a clean 50ml beaker on a calibrated and tarred measuring scale 2. To the closest milligrams, read the weight of the beaker. 3. take a note of the 50 mL beaker's result. 4. put a rough inaccurate amount of water into the 100 ml beaker 5. connect the pipet pump onto the 25ml pipet. 6. Fill to the 25ml meniscus with accuracy. (Make sure that when drawing up the water the pipet does not touch the beaker as they are fragile and can easily break) 7. Release the water in the 25ml pipet into the pre-weighed 50ml beaker (Make sure that the pipet Is fully drained this could take around 20 seconds) 8. Weigh the 50ml beaker again, but this time with the water. (Find out the mean of mass of the beaker by using the density and temperature of the water) 9. Once you've calculated the mass, compare it to the quantity of water that should have been moved technically. 10. Carry out this calibration procedure three times more. 11. then find out the average Why calibrate a volumetric flask For mixing solutions, a volumetric flask is used. In all laboratory settings, volumetric glassware calibration is required to achieve correct findings. Before any glassware is used, it must be calibrated. Equipment needed to calibrate a volumetric flask  Acetone  Scale  Distilled water  Thermometer  Volumetric flask method of calibrating a volumetric flask 1. After cleaning the flask with acetone, wash and dry it. 2. Calculate the weight of the flask 3. Pour distilled water until the flask reaches the meniscus. 4. Fill the flask with water and reweight it. 5. Use a calibrated thermometer to record the temperature. 6. To guarantee accurate calibration, repeat steps 3–4 times. Volume = weight before – weight after / density Weight of the volumetric flask without water 96.23 g Weight of the volumetric flask with water 350.60g Temperature of water 22 degrees cilices Weight of the boat and sodium carbonate 1.30g Mass = density (times) temperature My temperature was 25.38 degrees Celsius. Which meant that my water density was 0.996813 0.996813 x 25.38 = 25. 2d. p = 25.30 Why Calibrated a burette The most common application of a burette is in titration. The stopcock enables me to add a drop of acid to the solution, resulting in a distinct colour shift. It is critical to maintain the burette clean since liquid might adhere to the burette's walls and contaminate the other solution placed within. This can result in an incorrect final result, perhaps destroying the entire titration. As a result, conditioning is required to avoid contamination. Method of calibrating a burette 1. Get a clean beaker and weigh it (beaker 1) 2. Fill the burette with water up to the 0 mark using a funnel. (Make sure there are no air bubbles in the burette's water. to properly clean the burette's walls) 3. Pour the water into the second beaker. 4. Take the second beaker and weigh it. 5. Measure the temperature and write it down. 6. Do this at least three times. Volume =weight before – weight after / density Calibration of a pH meter 1. If available, collect pH calibration buffer solutions of 4.00, 7.00, and 10.00. 2. Turn the machine on. Allow time for the electronics to settle and, depending on the model, adjust the temperature control to allow for the buffer solution. 3. Remove the protective cap from the electrode and clean it with distilled water before immersing it in buffer solution 7. Rep for each buffer solution, washing the electrodes each time with pure water. when required, make adjustments 4. After cleaning the electrode with distilled water, place it in the sample. Making a standard solution Aim The goal is to create a standard sodium carbonate solution of 250cm3. A standard solution is one whose concentration is known to be exact.