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 1.During inspection, the attributes and variable characteristics of a product is being compared against its specification to find out if the product is within the prescribed limits 2.Standard solutions of acids should be preserved in tightly stoppered bottle fitted with soda-lime tube to protect from carbon dioxide of the air 3.All burets should be tested for leakage prior to use

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 1.During inspection, the attributes and variable characteristics of a product is being compared against its specification to find out if the product is within the prescribed limits 2.Standard solutions of acids should be preserved in tightly stoppered bottle fitted with soda-lime tube to protect from carbon dioxide of the air 3.All burets should be tested for leakage prior to use

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter17: Electrochemistry

Section: Chapter Questions

Problem 80AP

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Foreattt part of iTIS qtestfoni; tonsider FOHOWIHg Btetat: You need to make a stock solution of Ca( C2H3O2 )2 with a concentration of 6.50 M. You have a 850.0 mL volumetric flask available to make this stock solution in. You are then tasked with using this stock solution to prepare a sample for use in an experiment. The experimental sample should have a final volume of 15.0 mL and a concentration of 0.350 M Ca(C2H3O2)2. a) What is the molar mass of Ca(C2H3O2)2? b) How many moles of the solute would be needed to create the stock solution using the volumetric flask available? c) How many grams of the solute should be added to the volumetric flask to create the stock solution? d) What volume, in mL, of the stock solution should be used to prepare the experimental solution through dilution? US 目 M
A mixture has thre components. The percentage of sand was determined to be 26.04%, the percentage of benzoic acid was determied to be 25.92%, and the percentage of salt was determined to be 35.97%. Calculate the total precent recovery.
A 2.0 g of MgCO, was dissolved and diluted to exactly 500-mL volumetric flask. If 50-mL aliquot was used in the analysis, what is the weight of MgCO; present in the aliquot sample.
A student was tasked to perform gravimetric analysis of a soluble sulfate. His unknown sample weighed 0.7543 g. The sample underwentprecipitation using BaCl2 and was digested for overnight. The precipitate was then filtered off to obtain white crystalline precipitate that was collected inan ash less filter paper. In performing constant weighing, he obtained a crucible mass that is 29.9442 g. After burning his samples inside the crucible,the obtained mass was 30.3375 g. Compute for the theoretical % SO3 obtained by the student and the theoretical mass (g) of SO3 that should be obtained by the student using his weighed sample
A student was tasked to perform gravimetric analysis of a soluble sulfate. His unknown sample weighed 0.7543 g. The sample underwentprecipitation using BaCl2 and was digested for overnight. The precipitate was then filtered off to obtain white crystalline precipitate that was collected inan ash less filter paper. In performing constant weighing, he obtained a crucible mass that is 29.9442 g. After burning his samples inside the crucible,the obtained mass was 30.3375 g.29. Compute for the mass (g) of BaSO4 from the experiment.A) 0.3933B) 0.3393C) 0.3133D) 0.3951E) 0.359130. Compute for the experimental mass (g) of SO3 in grams obtained by the student.A) 0.1439B) 0.1349C) 0.1943D) 0.1394E) 0.359131. Compute for the experimental % SO3 obtained by the student.A) 73.21B) 56.33C) 17.89D) 56.89E) 72.8032. Compute for the theoretical % SO3 obtained by the studentA) 0.3933B) 56.37C) 17.33D) 17.89E) 0.425233. Compute for the theoretical mass (g) of SO3 that should be obtained by the student…
A mixture contain benzoic acid, salt, powdered silica (white sand) and contaminated with coloring. The aim of the experiment is to recover the pure benzoic acid and salt , make a schematic diagram or sketch on what method is applied to separate each component from the mixture to obtain the desired product.
Weigh accurately 4.0 g of sodium chloride into a 250cm3 volumetric flask. Using a wash bottle add about 200cm3 of distilled water. Stopper the flask. Shake vigorously for three minutes. Remove the stopper for a second then continue to shake for about another two minutes until all the solid has dissolved. Add more water slowly upto exactly the 250 cm3 mark. 1.Calculate the number of moles of sodium chloride present in: (i) 4.0 g (ii) 250 cm3 solution in the volumetric flask. (iii) one decimeter of solution
12 Which of the folowing is nota reason tora chemist to takeameting point ofa sample? a To check the purity of the solvent b To check the purity of the sample e To identity he sample d. To venty the sample 13 A chemist recrystalizes a sample as slowly as possible fur all of the fowing reasons except a To make the crystats as pure as possible To trap as litle solvent as possible e To make the sample as pure as possible d To remove the impurities faster 14 What type of reaction was the synthesis of Cyclohexane as seen below OH H,SO. a SNI b. SN d E 15 Label the dishilation apparatus, glassware and corect water flow in diagram below ton a
General, Organic and Biochemistry - Laboratory Manual 3. a) How would you record the following volume measurement on a burette shown in the picture using rules of significant figures? 07 . mL V= b) If the burette was used to dispense a certain amount of solution, and the new volume reading is shown in the picture below, what volume of the solution was dispensed? Use rules of significantfigures and showyour work! 9FD 11 AHUA 12 /0 09/W0 1 #11 mL Vdispensed 1 Show work: DNH UO 61 10 me
[Review Topics] [References] Use the References to access important values if needed for this question. An aqueous solution of ammonium acetate, NH, CH3COO, is made by dissolving 8.30 grams of ammonium acetate in sufficient water in a 100. mL volumetric flask, and then adding enough water to fill the flask to the mark. What is the weight/volume percentage of ammonium acetate in the solution? Weight/volume percentage = % Submit Answer Retry Entire Group 4 more group attempts remaining Previous Email Instructor Next Save and Exit
10 of 11 I Review | Constants Periodic Table s. Part B The equation for molarity, M, is M= 4 where V is volume and n is the number of moles of solute. ple A certain solution has a molarity of M = 5.85 mol/L and has a volume of V = 0.840 L. What is the value of n? Express your answer numerically in moles. • View Available Hint(s) e. ts n = mol 8:52 PM 42% 67°F 8/31/2021
ou are asked to weigh 2 g of lithium and add it to 1500 ml of distilled water +2drops of indicator, knowing that the density of water is 1 at room temperaturewhile conducting this experiment. first, Determine the amounts of the product; (LiOH) After knowing the amount of LiOH, you need to dilute to prepare 0.25 M of LiOH in a 3000 ml solution. Show your calculation and units. Knowing that the initial volume that you used was 1500 ml Use this equation to calculate ( CLiOH x VLiOH) before dilution = (CLiOH x VLiOH) after dilution