a. Convert analyses to meq/L b. What are the total cations and anions in meq/L? Do they generally balance? c. What is the charge balance error?
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Given the following groundwater analysis, work this problem by hand or with a Matlab Live Script: Ca2+ 76.8 mg/L Mg2+ 20.54 mg/L Na+ 11.72 mg/L K+ 1.67 mg/L Fe2+ 6.38 mg/L SO4 2- 37 mg/L HCO3 - 305.4 mg/L Cl- 13.25 mg/L pH = 8.3
a. Convert analyses to meq/L
b. What are the total cations and anions in meq/L? Do they generally balance?
c. What is the charge balance error?
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- An analysis of city drinking water for total hardness was done by two students in the laboratory and produced the following results (in ppm CaCO3): Student A: 228.3, 226.4, 226.9, 227.1, and 228.6. Student B: 229.5, 226.1, 230.7, 223.8, and 227.5 what is the coefficient variation?Determination of known acid concentration Trial 1 Trial 2 Trial 3 Volume of acid used (mL) 25 mL HCl 25 mL HCl 25 mL HCl Initial buret reading (mL) 50 mL 50 mL 50 mL Final buret reading (mL) 30 .7 mL 31.1 mL 29.3 mL Volume of NaOH used (mL) 50 mL 50 mL 50 mL Molarity of NaOH Calculated Molarity of HCl Show a sample calculation of HCl molarity Average concentration of HCl from Trials 1,2, and 3 The “true” concentration of HCl is 0.10 M. The calculated average concentration of HCl is ______________M. The % error is = (???? − ?????)/????? ? 100A student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M (x-axis) versus absorbance (y-axis) gives a linear trendline of y = 0.345x - 0.11. c.) How many grams of Cu(NO3)2 are present in 100 grams of solution? How many grams of water?
- 1. A solution contains a mixture of Na2CO3 and NaOH. Using phenolphthalein indicator 25 mL of mixture required 19.5 mL of 0.995 M HCl for the endpoint. With methyl orange, 25 mL of solution required 25 mL of the same HCl for the endpoint. Calculate grams per liter of Na2CO3 in the mixture. a.23b.36 c.78 d.112. A 1.2040 g sample containing sodium carbonate and inert material was dissolved in water and titrated to methyl orange end point, requiring 32.50 mL of 0.1020 M HCl. Calculate the %Na2CO4 in the sample. a. 93.36% b. 14.59% c. 12.75% d. 23.41%3. A 0.1510 g KHP (MW = 204.22 g/mol) sample required a volume of 57.04 mL of NaOH solution to reach a phenolphthalein end point. Calculate the molarity of NaOH titrant. a. 0.02593 M b. 0.006481 M c. 0.01296 M d. 0.01012 MA sample (50 mL) of a bottled water was added to a 100 mL volumetric flask and then diluted to the mark. From this stock solution, 50 mL was taken, added to a 100 mL volumetric flask and diluted to the mark. Final concentration of the serial dilution: 587.7161ppm. 1. what is the concentration in the original bottle (ppm)For the CO2 impact experiment station: 1) Obtain two plastic cups, red cabbage indicator, a straw, and plastic wrap. 2) Fill each cup approximately one-quarter to one-third full of tap water and add ~10 mL of the red cabbage indicator. 3) Place the two cups side by side on a sheet of white paper. 4) Place the straw into one of the beakers and cover that beaker with the plastic wrap. 5) Carefully blow bubbles into the test cup for 3 min. and observe both cups. 6) Compare the color to the control cup and record any differences. This the Question: Did the beaker with the solution into which CO2 was bubbled change pH/color? By how much? Is this what, you would predict, based on your knowledge of the chemistry of CO2?
- What is the Kw of pure water at 15.0 C if the pH is 7.20? a. 6.31 x 10^8 b. 1.26 x 10^-14 c. 3.98 x 10^-15 d. 1.26 x 10^-7 e. 1.00 x 10^-14Calculate the percentage purity of naproxen (FW 230.26) from the following data. 212.9 mg of naproxen was weighed and dissolved in a mixture of 25 ml of water and 75 ml methanol. It was titrated with 0.1024 M sodium hydroxide solution, using 1 ml of phenolphthalein solution as indicator. 8.08 mL of sodium hydroxide was required to neutralize the solution. Record your answer in decimal notation to 2 decimal places.What is the solubility of CdS (Ksp = 1.0 x 10-28) in pure water? Group of answer choices 1.0 x 10-7 M 1 x 10-14 M 1.0 x 10-28 M 1.0 x 10-56 M
- A student needs 50.0 mL of 5.74×10 -4 M FD&C Blue Dye No. 1 solution. If the student has 2.00 mM FD&C Blue Dye No. 1 stock solution to work with, how much of the 2.00 mM solution should be added to the 50.0 mL volumetric flask? Hint, 2.00 mM is 0.00200 M. 14.35 mL 0.06971 mL 3.485 mL 12.85 mL 6.971 mLI need help completing a lab report for chemistry. I attached assignment questions and lab obervations. Important notes: - The salt I worked with was a hydrated CaCl2*(H2O)2 salt. - Density for 1st diluted salt solution was 0.968g/mL, mixed 22mL of salt solution with 6mL of water - Density for 2nd diluted salt solution was 0.944g/mL, mixed 15mL of salt solution with 13mL of water -Density for 3rd diluted salt solution was 0.956g/mL, mixed 8mL of salt solution with 20mL of waterCedrick and Astrid a 20.00 ml aliquot of grapefruit juice with a 0.165 M NaOH solution to the end point. The initail buret reading was 1.72ml and final buret reading was 15.51ml. They calculated that there was 0.1457g of citric acid present in the juice sample. What is the amount mg of citric acid present per ml of juice? the answer is 7.29mg/ml. (can you please show me how to calculate this answer)