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- Using the reaction of Zn and Cu(NO3)2, write the balanced net ionic equation.
10 grams of Zn in 0.1M Cu(NO3)2
Zn (g)
Cu (g)
Zn2+ Molarity
Cu2+ Molarity
Max. Temperature
Color Observation
9.67310 g
0.317730 g
0.100000
Around 0
Around 300 C
White/ transparent
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- A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.554 M stock solution of beta-carotene and creates Dilution A by transferring 23.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 99.00 mL. She creates Dilution B by transferring 59.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 73.00 mL. She creates Dilution C by transferring 8.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 25.00 mL. She measures the absorbance of each solution and obtains the values below. Plot the data in a spreadsheet software and determine the best-fit line. What is the slope of the best-fit line? Report your answer with three places after the decimal. Remember to draw a dilution diagram! The best-fit line will likely look atrocious, since this is completely fictitious data. Solution Absorbance Stock solution 0.971 Dilution A…A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.661 M stock solution of beta-carotene and creates Dilution A by transferring 26.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 94.00 mL. She creates Dilution B by transferring 43.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 75.00 mL. She creates Dilution C by transferring 6.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 15.00 mL. What is the concentration in mM of Dilution C?A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.677 M stock solution of beta-carotene and creates Dilution A by transferring 25.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 94.00 mL. She creates Dilution B by transferring 50.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 83.00 mL. She creates Dilution C by transferring 6.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 21.00 mL. She measures the absorbance of each solution and obtains the values below. Plot the data in a spreadsheet software and determine the best-fit line. What is the slope of the best-fit line? Report answer with three places after the decimal. Solution Absorbance Stock solution 0.844 Dilution A 0.140 Dilution B 0.463 Dilution C 0.223
- A student prepares a stock solution of BaF2 by dissolving 50.00 g of a BaF2 in 1.00 L of water. An additional 2 drops of 37% (w/v%) HCI was added to acidify the solution. How many mL of the stock solution will be transferred to prepare a 100.00 mL solution with 0.10 M BaF2 solution? a. 38.05 mL b. 35.07 mL c. 380.5 mL d. 37. 50 mL e. None of the aboveA researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.609 M stock solution of beta-carotene and creates Dilution A by transferring 13.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 96.00 mL. She creates Dilution B by transferring 52.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 78.00 mL. She creates Dilution C by transferring 2.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 21.00 mL. What is the concentration in mM of Dilution C? Report your answer with one place after the decimal.A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.558 M stock solution of beta-carotene and creates Dilution A by transferring 15.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 90.00 mL. She creates Dilution B by transferring 53.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 80.00 mL. She creates Dilution C by transferring 2.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 15.00 mL. What is the concentration in mM of Dilution C? use one decimal place
- A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.558 M stock solution of beta-carotene and creates Dilution A by transferring 15.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 90.00 mL. She creates Dilution B by transferring 53.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 80.00 mL. She creates Dilution C by transferring 2.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 15.00 mL. What is the concentration in mM of Dilution C? Report your answer with one place after the decimal. Remember to draw a dilution scheme!The following reactions happen simultaneously when HCl is added to a mixture of Mg(OH)2and MgCO3:Mg(OH)2 + 2HCl → MgCl2 + 2H2OMgCO3 + 2HCl → MgCl2 + H2O + CO2What volume (in mL) of 37 wt.% HCl solution (density = 1.2 g/mL) is needed to completelyreact a 25-g mixture of 35.2% MgCO3 and 64.8% Mg(OH)2 by weight?148. Addition of 50.00 mL of 2.238 m H2SO4 (solution density = 1.1243 g/mL) to 50.00 mL of 2.238 M BaCl2 gives a white precipitate. (a) What is the mass of the precipitate in grams? (b) If you filter the mixture and add more H2SO4 solution to the filtrate, would you obtain more precipitate? Explain.
- (A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In the Winkler Titration Method, sodium thiosulfate is standardized against a known concentration of magnesium iodate. The normality (N) of a solution is always equal to its molarity (M). 2. In the experiment on determining the dissolved oxygen concentration of a water sample, the compound used to acidify the sample was hydrochloric acid. An acidic solution will have a pH greater than 7. 3. Radioactive wastes, like uranium, must be handled and disposed of according to special regulations designed to protect people and the environment. Nuclear power plants produce too much greenhouse gases due to the burning of uranium.A standard solution of (FeSCN)2+ was prepared by mixing 5.00 mL of 0.00200 M KSCN , 6.00 mL of 0.220 M Fe(NO3)3 , and 14.00 mL of 0.050 M HNO3. What is the total volume of solution in the container after all reagents have been mixed? (please type answer not by hend )12. a. What is the molarity of a solution made by mixing 125 mL of 5.00 M H3PO4 with 325 mL H2O? b. What is the molarity of a solution make by mixing 75 mL of 0.25 M Na2SO4 with 150 mL H2O? c. What volume of 9.00 M HNO3 is needed to make 675 mL of 0.750 M HNO3? d. What volume of 15.0 M H3PO4 is needed to make 750.0 mL of 3.0 M H3PO4?