Match the substances to the method used in the assay Acetazolamide Benzaldehyde Chlorambucil Ethylparaben Poldine Methyl Sulfate Allopurinol Potentiometric Thymol blue Bromophenol Phenolphthalein Bromothymol Blue Cresol Red Determination Blue Direct Titration Residual Titration Nonaqueous assay Ethylparaben Chlorambucil Acetazolamide Allopurinol Benzaldehyde
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- True/False Indicate whether the statement is true or false. Write T if the statement is true while F if statement is false on the before each number 4.Assay of acetic acid in vinegar is an example of proximate analysis 5.Example of variable defects are color, clarity, sheen, cleanliness, smoothness, taste, and presence or absence of a characteristic. 6.Liberation of carbon dioxide during acid-alkali titration renders the analyte acidic BXanthurenic acid stock solution Absorbance 25 0.052 50 0.128 75 0.202 100 0.310 150 0.448 200 0.621 Plot a graph, from graph, y=mx (force the trend line to pass through origin since the blank with no xanthurenic acid was set to be zero absorbance) in which, y: Absorbance, x concentration57% O P 6:01 Asiacell l. التجربة الرابعة - اول مسائي.pdf امتحان بالتجربة الرابعة المرحلة الأولى مسائي Answer these questions: Examination time: 30 min Q1// Complete these statements: 1- Titrand should be put in ..... 2- Indicator should be added to ..... 3- Titrand have known ....... and unknown ...... 4- Indicator is used to ........ 5- Titrant have known....... and unknown ......... 6- Titrant should be put in ... Q2// prepare 0.1 N standard solution of C,H204.2H;O in 50 ml of distilled water, using the law of molar concentration above, if the atomic weight of C = 12 0=16 H=1 Q3// Write these chemical equations: 1- Reaction of hydrochloric acid aqueous solution & sodium hydroxide aqueous solution 2- Reaction of sodium hydroxide and water 3- The net ionic reaction of (reaction 1) Assistant Professor/ Dr. Nidhal. Yousif. Mohammed
- Determination of iodides by the Faience method with sodium indicator eosinate: A) Neither chlorides nor bromides interfere B) Chlorides do not interfere, but bromides interfere C) Both chlorides and bromides interfere D) Chlorides interfere, but bromides do not.Calculate the average and standard deviations for each solution (and solvent).Title: Potentiometric Acid Titration fitulo:Tabla de ph volumen NaOH (ml) ph Titulación NaOH 20 4.25 7.39 20.1 6.24 7.03 7.21 6.83 6.59 20.2 6.59 6.24 20.3 6.83 6 20.4 7.03 4.25 20.5 7.21 20.6 7.39 1 19.9 20 20.1 20.2 20.3 20.4 20.5 20.6 20.7 V NAOH (ml) With the previous graph determine the following: a. Determine the bufer zone on the graph b. Determine the volume at the stoichiometric point of the acid titration c. Determine the average volume d. Use the medium volume to get the pka e. From pka, get the value of ka
- The concentration of methylene blue in the sample is estimated through (select the correct) options: refractive index measurement (refractometry). turbidity measurement (turbidimetry). absorbance measurement (spectrophotometry). titration with 2% HCl solution.Concentration sodium thiosulfate solution used: 0.056 mol L-1 ACCURATE TITRATION VOLUME OF SODIUM THIOSULFATE SOLUTION USED Volume titration 1, (ml) Volume titration 2, (ml) Your Group 15.80 15.75 Group 1 16.05 15.70 Group 2 16.30 16.25 ANALYSIS Average volume used, (mL) Standard deviation Number of moles sodium thiosulfate used, (mol) Number of moles calcium iodate in solution, (mol) Volume of calcium iodate used, (mL) Concentration of saturated calcium iodate solution (mol L-¹) Unrounded value 15.9750 0.26220 Rounded value 15.97 0.262 10.0▪ In a blood alcohol analysis by GC-FID, methanol elutes at 1 min, ethanol at 2 min, IPA at 3 min, and IS at 4 min. In the patient sample, the analyte elutes t 2 min and the IS at 8 min. What is the relative retention time and the analyte in the patient? ▪ A) methanol B) Ethanol ▪ C) IPA
- Concentration sodium thiosulfate solution used: 0.056 mol L-1 ACCURATE TITRATION VOLUME OF SODIUM THIOSULFATE SOLUTION USED Volume titration 1, (mL) Volume titration 2, (mL) Your Group 15.80 15.75 Group 1 16.05 15.70 Group 2 16.30 16.25 ANALYSIS Average volume used, (ml) Standard deviation Number of moles sodium thiosulfate used, (mol) Number of moles calcium iodate in solution, (mol) Volume of calcium iodate used, (mL) Concentration of saturated calcium iodate solution (mol L-¹) Unrounded value 15.9750 0.26220 0.00089400 0.00036700 A Rounded value 15.97 0.262 8.94 x 10-4 10.0 MinimizeBuffer Acetic Acid Sodium Acetate Calculated Observed System ID Volume of ~0.50 M HC2H3O2 (mL) Volume of ~0.50 M NaC2H3O2 (mL) pH pH 1 30 3 2 24 6 3 15 15 4 6 24 5 3 30Make a potentiometric titration graph and the first and second derivatives to determine the equivalence point of the following data 1* derv Vavecage 2nd derv Vaverase. Vol titrant PH A pH AV. A² pH AV² (ml) 10.679 7.643 10.696 7.447 10.713 7.091 10.721 6.700 10.725 6.222 10.729 5.402 10.733 4.993 10.738 4.761 10.750 4.444 10.765 4.227