Answer True or false for these statements. 1a-All tests on the unknown cations are complete without confirmations. 1b- The reactions must be mixed well with a stirring rod. 1c- When finished with the experiment, pour the contents of the “Discard” beaker into a waste container.
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Qualitative analysis experiment 8-
Answer True or false for these statements.
1a-All tests on the unknown cations are complete without confirmations.
1b- The reactions must be mixed well with a stirring rod.
1c- When finished with the experiment, pour the contents of the “Discard” beaker into a waste container.
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Solved in 2 steps
- 10.00 mL of the Unknown Acid B with a concentration of 0.1205M was placed into an Erlenmeyer flask containing an acid/base indicator. 4.83 mL of 0.2519M Sodium Hydroxide was required to neutralize Unknown Acid B. How many millimoles of Sodium Hydroxide were used in this experiment? Do not type units into your answer.i) How many moles of hydrochloric acid were there in the volume of acid added in the titration? ii) How many moles of calcium hydroxide were there in the 25 cm sample of solution that the student used in the titration? iii) What was the concentration of the calcium hydroxide solution in mol/dm?What is the concentration of hydrochloric acid? Find the concentration using the information given below. Equipment used in the lab: 50 mL burette X M H2SO4 solution (aq) • Two 50 mL beakers 0.10 M NaOH (aq) Procedure: 25 mL volumetric pipette • Bromothymol blue indicator • Pipette pump • 250 mL Erlenmeyer flask Observations from the Titration Lab. Trial 1 Trial 2 Trial 3 Final burette reading 14.6 mL 27.85 mL 40 mL Initial burette reading 0 mL 14.5 mL 27.85 mL Volume of H2SO4 (aq) added 25 mL 14.6mL 13.35 mL 12.15 mL
- 1.In using a burette, why is it important (a) to rinse it with a little of the solution it is going to contain, (b) to clamp it vertically, (c) to have the part below the tap full? 2. The following procedures were carried out during the titration: (a) The sides of the conical flask were washed down with deionized water. (b) The conical flask was frequently swirled or shaken.A sample containing BTEX What is the appropriate quantitative and qualitative analysis method for it in the laboratory?explain why the volume of water did not need to be exactly measure or recorded in Titration?
- What is a qualitative test and what is a quantitative test?Volumetric Analysis Liza carefully pipets 25.0 mL of 0.525 M NaOH into a test tube. She places the test tube into a small beaker to keep it from spilling and then pipets 75.0 mL of 0.355 M HCl into another test tube. When Liza reaches to put this test tube of acid into the beaker along with test tube of base, she accidentally knocks the test tubes together hard enough to break them and their respective contents combine in the bottom of the beaker. Is the solution formed from the contents of the two test tubes acidic or basic? What is the pH of the resulting solution?A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. He has a 0.1834 M0.1834 M standard sodium hydroxide solution. He takes a 25.00 mL25.00 mL sample of the original acid solution and dilutes it to 250.0 mL.250.0 mL. Then, he takes a 10.00 mL10.00 mL sample of the dilute acid solution and titrates it with the standard solution. The endpoint was reached after the addition of 13.96 mL13.96 mL of the standard solution. What is the concentration of the original sulfuric acid solution?
- A student titrated a vinegar sample with 0.44M NaOH titrant. Then a 5.0mL vinegar sample is mixed with 50mL water in a flask, then phenolphthalein is added, and lastly titrated. The burette gives a reading of 1.40mL before titration and 10.25 mL after. Therefore, what is the concentration of the 5.0mL vinegar sample?Why is it all right to use a wet flask or to use water during the titration?10.00 mL of the Unknown Acid A with a concentration of 0.1505M was placed into an Erlenmeyer flask containing an acid/base indicator. 20.33 mL of 0.2213M Sodium Hydroxide was required to neutralize Unknown Acid A. How many millimoles of Unknown Acid A were used in this experiment? Do not type units into your answer.