Error Of 25cm3 Measuring Cylinder
Contents |
error'). Experimental uncertainty arises because of: Limits in the how exact the measuring apparatus is. This is the precision of the
Uncertainty Of Measuring Cylinder
apparatus. Imperfections in experimental procedures. Judgements made by the operator. When can my percentage error chemistry equipment results be said to be precise? If you repeat a measurement several times and obtain values that are close burette error together, your results are said to be precise. If the same person obtains these close values, then the experimental procedure is repeatable. If a number of different people carry out the
100 Cm3 Measuring Cylinder Uncertainty
same measuring procedure and the values are close the procedure is reproducible. What is a systematic error? A systematic error is one that is repeated in each measurement taken. If this is realised after the experimental work is done, it can be taken into account in any calculations. What are random errors? Even the most careful and experienced operator cannot avoid random
Percentage Error Of 25cm3 Pipette
errors. However, their effect can be reduced by carrying out a measurement many times (if the opportunity exists) and working out an average value. Let's look in more detail at 'built-in' uncertainty of some laboratory equipment... Some measurement uncertainties are given below: EquipmentMeasurement to the nearest: Balance (1 decimal place)0.08 g Balance (2 decimal place)0.008 g Balance (3 decimal place)0.0008 g Measuring Cylinder (25 cm3)0.5 cm3 Graduated Pipette (25 cm3, Grade B)0.04 cm3 Burette (50 cm3, Grade B)0.08 cm3 Volumetric Flask (250 cm3, Grade B)0.2 cm3 Stopwatch (digital)0.01 s Calculating the percentage uncertainty (often called percentage error) ... Now try calculating the following percentage uncertainties... 1.00 g on a 2 decimal place balance 10.00 g on a 2 decimal place balance 1.00 g on a 3 decimal place balance 10 cm3 in a 25 cm3 measuring cylinder 25 cm3 in a 25 cm3 measuring cylinder 25 cm3 in a 25 cm3 graduated pipette (Grade B) 25 cm3 in a 50 cm3 burette (Grade B) 250 cm3 in a 250 cm3 volumetric flask (Grade B) 50 s on a digital stopwatch 8% 0.8% 0.08% 5% 2% 0.16
Upload Documents Write Course Advice Refer your Friends Earn Money Upload Documents Apply for Scholarship Create Q&A pairs Become a Tutor Find Study Resources by School by uncertainty of measuring cylinder 100ml Literature Guides by Subject Get Instant Tutoring Help Ask a Tutor a Question
Uncertainty Of Pipette
Use Flashcards View Flashcards Create Flashcards Earn by Contributing Earn Free AccessLearn More > Upload Documents Write Course Advice Refer apparatus error your Friends Earn MoneyLearn More > Upload Documents Apply for Scholarship Create Q&A pairs Become a Tutor Are you an educator? Log in Sign up Home Cambridge CHEMISTRY CHEMISTRY 9701 9701_s11_qp_34 Using http://www.avogadro.co.uk/miscellany/errors.htm a 25 cm 3 measuring cylinder add about 10 cm 3 SCHOOL Cambridge COURSE TITLE CHEMISTRY 9701 TYPE Test Prep UPLOADED BY RitwikP PAGES 12 Click to edit the document details This preview shows pages 3–7. Sign up to view the full content. View Full Document Using a 25 cm 3 measuring cylinder, add about 10 cm 3 of FB 4 . • Using the same https://www.coursehero.com/file/p7an8l1/Using-a-25-cm-3-measuring-cylinder-add-about-10-cm-3-of-FB-4-Using-the-same/ measuring cylinder, add about 10 cm 3 of FB 5 . • Titrate the mixture in the flask with FB 2 until the colour is pale yellow. • Add about 10 drops of starch indicator. A blue-black colour should be seen as the starch reacts with the remaining iodine. • Continue to add FB 2 until the blue-black colour just disappears leaving a colourless solution. You should perform a rough titration . In the space below record your burette readings for this rough titration. The rough titre is ……………… cm 3 . • Carry out as many accurate titrations as you think necessary to obtain consistent results. • Make certain any recorded results show the precision of your practical work. • Record in an appropriate form below all of your burette readings and the volume of FB 2 added in each accurate titration. [7] (b) From your accurate titration results obtain a suitable value to be used in your calculations. Show clearly how you have obtained this value. The iodine produced by 25.0 cm 3 of FB 3 required ……………… cm 3 of FB 2 . [1] I II III IV V VI VII
be down. Please try the request again. Your cache administrator is webmaster. Generated Fri, 14 Oct 2016 09:28:03 GMT by s_ac15 (squid/3.5.20)