Module 8 Unit 2 Assignment C

Ammonia (NH3, MM 17.031 g/mol) and hypobromite (OBr-) react according to the following chemical reaction. 2 NH3 + 3 OBr- —> N2 + 3Br- + 3 H2O Suppose 0.263 g of ammonia react with 19.0 mL of hypobromite solution. Calculate the concentration of the hypobromite solution

7. Calculate the molarity of Sn²+ ion for a solution that the concentration of Sn²+ at 20°C was determined to be 25.6 ppm Sn2+. The density of the solution at 20°C is 1.21 g/mL. 2.61 x 10M а. b. 2.16 x 10*M -2 с. 3.10x 10M d. 3.68 M

2 1/1 point Barium sulfate is a contrast agent for X-ray scans that are most often associated with the gastrointestinal tract. Calculate the mass of BaSO4 that can dissolve in 100.0 mL of solution. The Ksp value for BaSO4 is 1.5x109 6.2x103g 8.1x10-5 g 9.1x10-4 g 1.2x10g

In the following solubility curve, the substance with the highest solubility in 100 g of water at 20 °C is: Grams of solute / 100 g H₂O 150 140 130 120 NaNO KNO 110 100 90 80 70 60 NH 50 40 30 20 10 0 Select one: a. NaCl b. KClO3 C. NH3 Od. SO2 HCI NH.CI ka NaCl KCIO SO 10 20 30 40 50 60 70 80 90 100 Temperature °C

The amount of water which should be added to 0.700 M NaOH solution to make 100 mL 0.250 M solution is 19 Multiple Cholce 00:5213 79.6 mL 35.7 mL 55.2 mL 64.3 mL 30.5 mL Mc Graw Hill Type here to search 立

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

uestion 9 of 9 Unknown salt calibration curve 10- The calibration curve was generated using known concentrations of five solutions of a newly discovered inorganic salt. The density value of each solution was 9. determined and the curve with its equation is shown in the 8- y= 1.11x+ 0.203 graph. A student is asked to analyze a solution of this salt with a density of 2.00 g/mL. What is the concentration, in % 7- (w/v), of the unknown salt solution? 5- salt concentration = % (w/v) } TOOLS x10 i 2 3 4 5 67 8 9 10 Salt concentration %(w/v) 山T四 stv A A hulu MacBook Density (g/mL)

What volume of 0.100 M H3PO4 is required to completely neutralize 15.0 mL of 0.200 M NaOH? H3PO4 + 3NAOH→ 3H20 + Na3PO4 O 10.0 mL O 7.50 mL 30.0 mL 90.0 mL 5.00mL

Can you solve the question in the picture shown?

What volume of 0.200 M HCl is just sufficient to neutralize 50.0 mL of 0.400 М Ba(ОН)2? 20.0 mL 50.0 mL 100.0 mL 200.0 mL 250.0 mL

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…

The volume of 0.16M NaOH needed to react with 40 mL of 0.12M H2SO4 is     30 mL     40 mL     53 mL     60 mL

7. What volume of 0.300M H2SO4 is required to exactly neutralize 200mL of 0.500M NaOH?2NaOH + H2SO4  Na2SO4 + 2H2O

A student, performing the same experiment as you, recorded the following information. The original solution was diluted by a factor of 5.Calculate the volume of NaOH used to reach the equivalence point. Volume of diluted vinegar sample (mL)     25.00 Molarity of NaOH                                       0.0900 Initial buret reading (mL)                            16.50 Final buret reading (mL)                             38.00 Volume of NaOH

Question 7 If the concentration of sodium carbonate in water is 12.8 ppm, what is the molarity of Nazco.(aq)? The molar mass of Na,CO, is 106.0 g/mol. Assume the density of the solution is 1.00 g/mL. a) 8.28 x 10-6 M 3 b) 1.21 x 104 M c) 1.36 x 10-3 M d) 0.136 M e) 0.121 M Question 8 Which of the following compounds is not miscible with water? a) CH3NH2 b) CH3COOH c) Cl4 d) CH3CN e) HOCH2CH2OH Question 9 The solubility of 1-pentanol in water is 2.7 g per 100 g of water at 25°C. What is the maximum amount of 1-pentanol that will dissolve in 3.6 g of water at 25°C? a) 0.097 g b) 0.75 g c) 2.7 g d) 9.7 g e) 0.0075 g

How to prepare these solutions? 250.0 mL 0.125 M stock Na2S2O3 solution from Na2S2O3·5H2O crystals 250 mL 0.10 M NaOHNOTE: Use the 1.0 M NaOH prepared250.0 mL standard 2500 ppm Cu(II) stock solutiona. Weigh and dissolve appropriate amount of Cu(NO3)2·5H2O crystals in enough distilled water.