In this experiment, the mass of pure copper provided is 0.491 gram, and then it was dissolved in nitric acid. An ammonia solution was added into it and transferred to a 100mL volumetric flask and dilute to 100ml with distilled water. This is the original standard solution. Then a diluted solution was prepared by adding 11 mL original standard solution to a 100ml volumetric flask and diluting to 100ml with distilled water. Please calculate the copper molarity of the diluted solution.

Saved Normal BIIIU fxl Ix Actual mass used in solution prep (g) Volume solution prepared Measured conductivity (uS/cm) Substance 0.1 g Naci 0.1003 100 mL 1149 0.1 g Nal 0.10 100 ml 419 Calculate the mass of Nal that would be necessary to yield the same conductivity as the NaCl solution. Clearly show these calculations in your lab notebook. Saved T BII U X X + fr Normal

A sample containing this BTEX was referred to the laboratory for quantitative and qualitative evaluation. What is your suggested way of working?

00 mL of a diprotic acid primary standard solution was accurately prepared to a concentration of 0.1431 M.  Three samples of this primary standard solution were used as samples in a titration to standardize an aqueous solution of sodium hydroxide, NaOH, which would be used as a titrant. Using the following table of data for the titration of the primary standard acid with NaOH, calculate the average concentration of NaOH.   Trial # Volume of primary standard Initial titrant volume Final titrant volume 1 10.00 mL 8.21 mL 27.22 mL 2 10.00 mL 27.22 mL 46.23 mL 3 10.00 mL 30.28 mL 49.29 mL        0.1506 M      0.0753 M      0.0376 M      0.1431 M      0.0526 M

DATA AND CALCULATIONS Show all calculations neatly on an attached sheet. Trial 1 Trial 2 Trial 3 70.6849. 68.0749 2.61g 23.25ML O.65ML 22.6mL Mass of flask + vinegar Mass of empty flask Mass of vinegar used Final buret reading Initial buret reading Volume of NaOH used Moles of NaOH used 0.00226 mol Moles of açetic acid titrated Mass of acetic acid titrated Mass % acetic acid in vinegar 5.0%

11. A 100.00 mL sample of orange juice, which has been fortified with calcium is titrated with 0.02357 M EDTA in the same method as this experiment. The initial buret reading is 0.15 mL and the final buret reading is 15.23 mL. How many mg of calcium are contained in the orange juice sample? Show your work. 12. What is the molarity of calcium in the orange juice sample from the above ques- tion? Show your work.

A student extracted 2.3521g of lycopene from tomato paste. The solid was placed it into a 20 ml volumetric flask and added solvent to the line. 2 ml of this solution was removed using a 2 ml volumetric pipet and placed into a 10 ml graduated cylinder and solvent was added to the 10 ml mark. What was the concentration of the dilute solution?