Which of the following is the best way to test the acidity or alkalinity of an unknownliquid sample in a test tube?a. Cut a long strip of litmus or pH paper and dip it to the test sample.b. Wet your finger with the test sample and touch a small piece of litmus or pHpaper on a watch glass.c. Place a small piece of litmus or pH paper directly into the test sample.d. Insert a clean stirring rod into the test sample, withdraw it, and touch it to thelitmus or pH paper on a watch glass

a species which liberates hydrogen ion on dissolution it is said to be acid a species which accept…

Answered: Which of the following is the best way…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter21: Potentiometry

Section: Chapter Questions

Problem 21.9QAP

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Phenol Red: What is the purpose of this test? Why is a Durham tube inverted inside the test tube? At what pH does phenol red register an acidic result? What is the color? What is the color of an alkaline result? If you see an acid result, what does this mean? What about an alkaline result?
This is NOT graded. Do # 20
26. What is the nature of samples that should NOTbe placed inside the drying-oven?A. Potential OxidantB. Potential ReductantC. AcidsD. Bases27. In measuring the volume of a liquid which apparatus will give you the most precise measurement up to two decimals places of empirical data?A. Volumetric Flask B. Graduated CylinderC. Burette D. Pipette28. In an experiment that aims to determine the acid strength of a sample by back titration, what is the indication that the endpoint has been reached?A. The burette volume is set to zeroB. The resulting solution changes colorC. The resulting solution gains a lingering dominant pink colorD. The Burette needs to be refilled by the titrant base29. After heating the sample in a drying oven for 45 minutes, the samples in a crucible should be placed into another apparatus to allow slow cooling to avoid weighing errors, what do we call thisapparatus?A. Drying panB. CentrifugeC. Analytical BalanceD. Desiccator30. Describe how you would prepare a 800-mL…
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Make 350 ml of a solution that is 25 mM Tris, 2.5 mM EDTA, and the pH is 8.0.Tris is a base and the FW of Tris is 121.1 and EDTA is 187. Do not make a volume that exceed
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what is nitrous acid and what is the test principle for nitrous acid test?
If two water samples were collected as follows: Sample #1 with a pH = 8.8 and the concentration of [HCO3-] = 0.01 molar Sample #2 with a pH = 87.0 and the concentration of [HCO3-] = 0.00 molar Compare the alkalinity of the two samples Which of these two samples was taken from a well-buffered lake?
Draw the Lewis structures for the nitrate and nitrite anions and use your structures to answer the following questions. a) give BOTH the electron pair geometry and the molecular geometry of the nitrate ion b) give BOTH the electron pair geometry and the molecular geometry of the nitrite ion c) Do these exhibit resonance? Explain how you know. d) Which anion has the shortest N-O bonds? Explain how you know. e) You can predict relative acid strength deciding which anion is better able to stablilize the negative charge. In terms of the resonance structures of the anions, which do you think is a stronger acid; nitrous acid or nitric acid? Explain your answer.
A basic solution turns _________ litmus paper to ______________. Select one: Blue; Red Red; Blue Red; Red Blue; Violet
complete solutions pls. thanks
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Which of the following is the best way to test the acidity or alkalinity of an unknown liquid sample in a test tube?