By what percent does the absorbance decrease if 12.25 mL of water is added to a 16.75 mL sample of 0.500M Cr3+
By what percent does the absorbance decrease if 12.25 mL of water is added to a...
If 2.0 mL of distilled water is added to 3.0 mL of a 0.150 M solution of CoCly, what is the concentration of the resulting solution? Show your work. (a) What is a calibration curve? (b) Why do we use a calibration curve to determine the concentration of our unknown 5. A colored sample with a concentration of 0.160 M has an absorbance of 0.80 in a 1.0 cm path length cuvette. (a) What would be the absorbance expected if...
20.00 mL unknown sample is diluted to 250.0 mL. Absorbance is 0.2430 Absorbance for 70.00 ppm std is .950 What is ppm concentration in the original undiluted sample?
0.5 mL of 1% (w/v) coagulant is added into 250 ml of raw water. 0.1 mL of 0.1% (w/v) polymer is added into the water sample with coagulant. What is the mass concentration of flocculant in mg/L
If 2 mL of water was added to B-Naphthol and heated in a steam bath, what happens? Does it dissolve or not?
QUESTION1 A 15-mL sample is added to à 300-ml 8OD bottle. Dilution water is added to the sample bottle and the initial dissoved axygen concentration is measured as 8.5 mg/L. After the sample is sealed, the laboratory incorrectly takes a measurement of dissolved oxygen reading on day 6 of 3 mg/L. If the BOD reaction rate coefticient for the sample is 0.30/day, estimate what the 5-day BOD should have been QUESTION 2 A 15-mL sample is added to a 300-mL...
A 25 mg sample of Ciprofloxacin (Mw 331.35 g/mol, a = 9.083 X 103/M-cm) is dissolved in 1 liter of water and the absorbance of a 10 ml sample is found to be 0.56 at 430 nm. What is the purity of the ciprofloxacin sample? (5 pts) 9.
A 25 mg sample of Ciprofloxacin (Mw 331.35 g/mol, a = 9.083 X 103/M-cm) is dissolved in 1 liter of water and the absorbance of a 10 ml sample is found to...
a sample of gold is added to 45.2 mL of water in a graduate cylinder, causing the water to rise to 46.8 mL. Determine the mass of the sample. the density of gold is 0.0193 kg/cm3 at 25 C
a. What is the new % (m/v) concentration when water is added to 25.0 mL of 20.0% (m/v) NaOH to make 300.0 mL of a diluted NaOH solution? b. What is the new molarity of the solution when water is added to 125.0 mL of 2.50 M NaOH to make 300. mL of a diluted NaOH solution?
00+ Soso 10.10 SU 0.725 mol/l 2 mol Answer: 5. Water is added to 150.0 ml of 2.20 M KCl solution to decrease its concentration to .0500M? ( 10 points) a. What is the new volume (in liters)? GISLI(2.20N) (osooM) L. 6.6 Answer: b. How much water in liters) must be added? Answer: 22 points
What volume of water must be added to a 33.16 mL solution of a pH 1.56 solution of HCIO4 to raise the pH to 4.33? mL License Points possible: 1
What volume of water must be added to a 33.16 mL solution of a pH 1.56 solution of HCIO4 to raise the pH to 4.33? mL License Points possible: 1