Lab 2

Only number 2. It has parts a , b, c

Pls help ASAP ON ALL ASKED QUESTIONS PLS PLS

A technician was analysing some waste water from an industrial plant. He collected 500 mL of the water and separated it into two 250 mL samples. He filtered one sample and evaporated the water from the other one. He weighed the dried solid residue from each sample. He found that the mass of solid from the filtered sample was 40 g and the mass from the evaporated sample was 55 g. What mass of soluble and insoluble material was in 1 L of the waste water?

To prepare benzil you are heating a solution of benzoin with concentrated nitric acid. Following this, you will add water, cool the mixture, and collect the solid. How will you treat/dispose of the left over liquid from this step? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d It must be neutralized with sodium bicarbonate and can then be washed down the drain. It must be neutralized with sodium bicarbonate and then disposed of in the organic waste container. It can be directly washed down the drain with lots of water. It can be directly poured into the organic waste container.

Gravimetric analysis is a quantitative method that involves measurement of volume of a solution of known concentration which is used to determine the concentration of the analyte.  True  False   A good example of complete analysis is the determination of %C, %H and %O in an unknown organic sample.  True  False

1) In lab you are given 4 bottles, each containing about 5 grams of a white substance. Near the bottles are four labels indicating each bottle contains a high purity substance. Assume these labels belong to the bottles and that each bottle contains a single substance.   The four bottles contain glucose (C6H12O6), sodium chloride (NaCl), aluminum oxide (Al2O3), and zinc sulfate (ZnSO4).   Using your knowledge of solubility rules and electrolytic behavior, describe tests that you could conduct to determine which label belongs to which bottle. For these tests you may only use DI water, an aqueous solution of barium nitrate, and a conductivity tester to identify the substance in each of the bottles. Give the results you would expect for each test.

Isotonic saline solution is 0.154 M NaCl(aq). What is the solubility of AgCl (Ksp = 1.8 × 10−10) in such a solution? Show your work.     a. 2.8 × 10−11 M   b. 1.2 × 10−9 M   c. 5.3 × 10−6 M   d. 0.077 M   e. 3.4 × 10−5 M

Mg3(PO4)2 BaCO3 MgF₂ Most soluble Least soluble Fe(OH)3 Answer Bank

Hd 10 5 0 5 mL of NaOH added 10 20 15 10 LO 5 0

You dilute the river water 10 times for the analysis of SDS concentration. The instrument measures an average molar concentration of SDS in the diluted river water to be 1.689 10-4 mol/L. The molar mass of SDS is 288.4 g/mol. What is the mass concentration of SDS in the original river water? 4.87 10-1 g/L 4.87 102 g/L 5.86 106 g/L 5.86 10-5 g/L

Dilution means adding water to something so that the ratio of solute to solvent is less than in the original solution. Some people say, “Dilution is the solution to pollution.” Do you think this statement true? Could you ever add enough water so that there would be no drink mix—that the water would be the same as in cup #6, pure water? Do you think you could you ever add enough water to a pollutant to make it disappear completely? Why or why not?

Here is a graph of the molarity of acetonitrile (CH, CN) in a reaction vessel during a certain chemical reaction. Use this graph to answer the questions in the table below. у 0.30- 0.25- 0.224 0.20 M 0.15– 0.10- 0.05 50 100 150 200 250 300 seconds

wum Oxide and Sr(IO3)2•H20 Name: POST-LAB QUESTIONS continued Section a. The solubility of barium iodate monohydrate in 25°C water is 0.028 g per 100. mL of water. Calculate the solubility, or in other words, the proportion of how much product would dissolve if you rinsed it with 125 mL of 25°C distilled water. b. Suppose you have 4.832 g of product and then rinse it with 125 mL of 25°C water, use the answer in 2a to calculate how much product would you expect to isolate. C. The solubility of barium iodate monohydrate in 4°C water is 0.010 g per 100 mL of water. Calculate the solubility, or in other words, how much product would dissolve if you rinsed it with 20.0 mL of 4°C distilled water. d. Suppose you have 4.832 g of product and then rinse it with 20.0 mL of 4°C water, use the answer in 2c to calculate how much product would you expect to isolate. e. Using your answers from (b) and (d), calculate the percent error or percent difference as a result of accidentally using the 25°C…

Can you help me understand how to get the dilution factors for each tube, please?

Calculate the quantity of 0.250 M NaCl needed to prepare 250 ml of 0.010 M NaCl. O a. 1 mL Ob.100 ml Oc. 0.1 ml O d. 10 ml

Calculate the concentration in ppm of Cd in a 2.00 mL sample which has been shown to contain 16.4 μg Cd. Assume the sample has a density of 1.00 g/mL.      a. 3.28 × 104   b. 8.20   c. 32.8   d. 8.20 × 10−3   e. 8.20 × 103

Part Two: Types of Solutions (saturated, unsaturated, supersaturated) On a solubility curve, the lines indicate the concentration of a amount of solute that will dissolve at that specific temperature. solution - the maximum Values on the graph could be dissolved at that temperature. (below, above, on) a curve represent unsaturated solutions - more solute Use the solubility curve on the first page to label the following solutions as saturated or unsaturated. If unsaturated, write how much more solute can be dissolved in the solution. Solution If unsaturated: How Saturated (S) or Unsaturated (Un)? much more solute can dissolve in the solution? a solution that contains 70g of NaNO3 at 30°C a solution that contains 50g of NH.Cl at 50°C a solution that contains 20g of KCIO3 at 50°C a solution that contains 70g of KI at 0°C

1. What is the concentration in ppm if 0.808 grams of CaCl2 is dissolved in 250 ml of water.  A. 11220 ppmB. 3220 ppmC. 2330 ppm

POSTLABORATORY ASSIGNMENT 1. An oleic acid, C17H33COOH (282 g/mol), solution is added to water in a watchglass until a monolayer forms. Assume that there are no spaces between molecules in the monolayer and that each oleic acid molecule occupies an area of 0.25 nm². If the concentration of the oleic acid solution is 0.00012 g/mL, what is the experimental value of Avogadro's number? dropper pipet calibration number of drops of oleic acid in the monolayer diameter of monolayer OMA 30+20 od os pulgad Im od of ingranit yd souls mesto bonstantial = || || || 00.1 arestusslom (0) N = = = Jorna ode 65 drops/mL 16 drops 14.5 cm dirua orli unalools) mano lo zemoristalls d A(otho) wall