A required characteristic of a primary standard with which we would use to standardize our sodium hydroxide solution is that the primary standard should a. be inexpensive b. have a relatively high molar mass c. be non-hygroscopic d. All of the above.
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A required characteristic of a primary standard with which we would use to standardize our sodium hydroxide solution is that the primary standard should
| a. |
be inexpensive |
|
| b. |
have a relatively high molar mass |
|
| c. |
be non-hygroscopic |
|
| d. |
All of the above. |
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- Which of the following is a good description of a standard solution as a titrant? a) selectively reactive with the analyte b) only reacts with the matrix c) oxidize when exposed to air d) reacts very slowly but completelyPlease determine how to make a working standard Solution of about 0.010mg/mL. Caffeine will be the active. Diluent will be water.What is/are the principle/s involved on ACIDIMETRIC ASSAY BY DOUBLE INDICATOR TITRATION?
- Note: Part A is already sovled. The ppm values of ions are presented on a tableList the advantages and disadvantages of a potentiometric titration relative to a direct potentiometricmeasurement.volumetric or graduated piptte, Which one of them is commonly used for Titration and reagent and which one is more accurate, why?
- A Fajans titration of a 0.7908-g sample required 45.32 mL of 0.1046 M AgNO3 . Express the results of this analysis in terms of the percentage of BaCl2 * H2O. (Use a MW value in 4 decimal places)Mention what error would be introduced in the analysis if the primary standard (KHP) is not properly dried.A suitable target for the titration is 30.0 cm3 of 0.025 moldm-3 Br2(aq) Justify why a much smaller target titre would not be appropriate Calculate the amount in moles of bromine in the target titer Justification? calculate a suitable massof alive oil to transfer to the volumetric flask using your answer to of above question and the structure of Y Assume that the olive oil contains 85/- of Y by mass (If you were unable to calculate the amount of bromine in the target titer,you should assume it is 6.25×10^-8 mol .this in not the correct amount)
- a) When considering the overall dialysis procedure, why is it important to exchange old/used dialysis buffer (or “dialysate” solution) with a fresh dialysis buffer solution at least once throughout the process? NOTE: Your TAs will do this for your group’s samples over the next week. b) This week’s lab utilizes a dialysis buffer with the following composition: 10 mM Tris-HCl, 10 mM MgSO4, and a pH of 7.4. Let’s presume an ERROR occurred with the creation of this buffer during the pH titration and you unknowingly titrated to a final pH of 5.0. What effects, if any, could you expect to observe on your final, dialyzed sample?Approximately 6.0mL of concentrated perchloric acid (70%) was transferred to a bottle and diluted with about 1.0L of water. A sample containing 251.5 mg of primary standard Na2B4O7.10H2O required 27.41 mL of the HClO4 solution to reach the methyl red end point. Calculate the molar concentration of the HClO4 (Fwt = 382g/mole)Why must be the primary standard be dried before used?