Answer to the following question: You and your lab partner are asked to pipet 4.0 mL...
Answer to the following question: You and your lab partner are
asked to pipet 4.0 mL of solution. You have available a 5-mL and a
1-mL glass pipet. The 5-mL pipet is dirty and your partner contends
that there is no reason to clean it, instead you should just use a
1-mL pipet and pipet four times. Is this a good idea? Why or why
not?
Homework Answers
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Answer to the following question: You and your lab partner are
asked to pipet 4.0 mL...
1aYou are measuring 10.00mL of liquid with a volumetric pipet. While you are drawing the liquid...
1aYou are measuring 10.00mL of liquid with a volumetric pipet. While you are drawing the liquid into the pipet, you remove the tip of the pipet from the solution and suck up a little bit of air into the pipet. You adjust the liquid so that the meniscus is at the calibration line, but you notice there are some air bubbles in the pipet. 1a.) How do the bubbles impact the amount of liquid that you will dispense? Will you...
3. If you pipet 10.00 mL of the solution you made in Question #2 into a...
3. If you pipet 10.00 mL of the solution you made in Question #2 into a test tube and then you pipet 10.00 mL of deionized water into the same tube. After stirring, what is the Allura Red concentration of the new solution you've made? Hint: use at least 2 extra significant figures from your answer to question #2 to calculate this answer to avoid rounding errors. Your final answer willl be reported to the correct number of sf. This...
15 pts) Your inept lab partner took 25.0 mL of a 0.155 M solution of Lies...
15 pts) Your inept lab partner took 25.0 mL of a 0.155 M solution of Lies and diluted in to 100.0 mL Unfortunately, instead of diluting it with water they uced 75 ml of 0.255M LICI. What is the molarity of the ions in the final solution? Assume that volume is additive.
You have 659.3 mL of a stock solution 4.660 M HCl. For a particular experiment, your...
You have 659.3 mL of a stock solution 4.660 M HCl. For a particular experiment, your lab partner prepared a diluted solution for you to use. In her notes, you read: " Using a volumetric pipet, took 246.54 mL of stock solution and diluted it to 739.21 ml in a volumetric flask. Then, took 100.00 mL of that solution and diluted it to 194.63 mL in a second volumetric flask. " What is the concentration that you should report for...
You come into lab and notice your lab partner did a 1:10 dilution series on a...
You come into lab and notice your lab partner did a 1:10 dilution series on a stock that you ordered. You see that the final dilution has a concentration of 0.0004 Molar and that your partner had diluted the stock seven times. What is the concentration of the original stock solution? is it 40,0000?
Name: Date: Instructor's Initials: Lab Section: Enthalpy PreLab What would happen if you used a wet...
Name: Date: Instructor's Initials: Lab Section: Enthalpy PreLab What would happen if you used a wet beaker to obtain your acid solution? How might this affect your results? 2. What is the difference between heat capacity and specific heat? 3. What is the purpose of using volumetric glassware for this experiment? 4. Why rinse the pipet three times with the solution to be used? How many ml of solution should be used to rinse the 100.00 mL pipet-5 mL, 10...
You and your lab partner are asked to determine the density of an aluminum bar. The...
You and your lab partner are asked to determine the density of an aluminum bar. The mass is known accurately (to four significant figures). You use a simple metric ruler to measure its dimensions and obtain the results for Method A. Your partner uses a precision micrometer and obtains the results for Method B. Method A () Method B () 2.1 2.700 2.2 2.698 2.6 2.702 2.3 5.805 The accepted density of aluminum is 2.702 . Calculate the percent error...
Your lab partner asks you to make 100 mL of a 1.50 M HCl solution for...
Your lab partner asks you to make 100 mL of a 1.50 M HCl solution for an experiment she would like to do. If ΔHsolution is -74.84 kJ/mol for hydrochloric acid, what would be the final temperature of a solution prepared by dissolving the necessary amount of HCl in 100.0 mL of room temperature (23.0 oC) water?
You must read the experiment and then answer these questions. 1. Look at the procedure for...
You must read the experiment and then answer these questions. 1. Look at the procedure for using a pipet. Why should you not force the last remaining amount of liquid out of the pipet? 2. If you have a 50.00 mL volumetric flask (a flask marked at a specific volume) and a pipette that measures up to 10-mL with marks to the nearest 1/10 mL, how much solute would you add to the flask to make 50.00 mL of a...
you ask your lab partner to add 1mL to a 10mL water sample to 99 mL...
you ask your lab partner to add 1mL to a 10mL water sample to 99 mL of diluent. Your partner inadvertently adds the entire sample of water to the diluent bottle. What was the intended dilution factor and what is the actual dilution factor?
3. If you pipet 10.00 mL of the solution you made in Question #2 into a test tube and then you pipet 10.00 mL of deionized water into the same tube. After stirring, what is the Allura Red concentration of the new solution you've made? Hint: use at least 2 extra significant figures from your answer to question #2 to calculate this answer to avoid rounding errors. Your final answer willl be reported to the correct number of sf. This...
15 pts) Your inept lab partner took 25.0 mL of a 0.155 M solution of Lies and diluted in to 100.0 mL Unfortunately, instead of diluting it with water they uced 75 ml of 0.255M LICI. What is the molarity of the ions in the final solution? Assume that volume is additive.
Name: Date: Instructor's Initials: Lab Section: Enthalpy PreLab What would happen if you used a wet beaker to obtain your acid solution? How might this affect your results? 2. What is the difference between heat capacity and specific heat? 3. What is the purpose of using volumetric glassware for this experiment? 4. Why rinse the pipet three times with the solution to be used? How many ml of solution should be used to rinse the 100.00 mL pipet-5 mL, 10...
You must read the experiment and then answer these questions. 1. Look at the procedure for using a pipet. Why should you not force the last remaining amount of liquid out of the pipet? 2. If you have a 50.00 mL volumetric flask (a flask marked at a specific volume) and a pipette that measures up to 10-mL with marks to the nearest 1/10 mL, how much solute would you add to the flask to make 50.00 mL of a...
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