(Concentration) You are tasked to prepare 50.000 ppm of a caffeine standard for an analysis. If you need to prepare 500.00 (±0.08) mL of this solution, how much (in grams) solid, pure caffeine are you supposed to dissolve? What absolute uncertainty is associated with your mass measurement if the prepared solution has a 0.12% percent relative uncertainty? Write your answer using the appropriate number of digits. Note that the formula mass of caffeine is 194.194 g/mol with negligible error. (absolute error) --- How many significant figures does your reported mass have? (number of sig. figs.) --- ---

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What is the absolute uncertainty and relative uncertainty of the molarity of the solution?   M =  = 0.078376462 = 0.078 M Pb2+

In this experiment, a series of solutions are prepared by combining multiple components into a single container. One solution prepared contains 5.00 mL of (1.1x10^-2) molar KI, 10.00 mL of 0.0010 molar Na2S2O3, 15.00 mL of water, 10.00 mL of (3.90x10^-2) molar KBrO3, and 10.00 mL of (1.000x10^-1) molar HCl. What is the concentration of iodide ions in this solution? Note: Your answer is assumed to be reduced to the highest power possible. When answering this problem, report the answer with the appropriate number of significant figures. Enter your answer USING scientific notation. When entering units, use proper abbreviated units with proper capitalization

I need help on questions 2-3?

Using the calibration curve below (equation of the line: y=0.0039x + 0.9981) to determine the percentage of sugar in a sugar water solution with a density of 1.034 g/mL. Density versus Percent Sugar 1.07 1.06 y = 0.0039x + 0.9981 R² = 0.9998 1.05 1.04 1.03 1.02 1.01 1 0.99 6 8 10 12 14 16 Percent Sugar (% m/m ) 8.5% 1.0% 9.2% 4.2 % 9.9% Density (g/mL) 2.

A student sets up the following equation to solve a problem in solution stoichiometry. (The ? stands for a number the student is going to calculate.) Enter the units of the student's answer.   I'm confused on what the next step is from here. I dont know if I need to switch the 10-3 to the bottom to make the 103 and how would I solve the problem from here?

A student prepares a 0.29 mM aqueous solution of trimethylacetic acid (C,H,CO,H). Calculate the fraction of trimethylacetic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits. |% x10

A student determined fluoride in a toothpaste sample using ion chromatography. A toothpaste sample of mass 0.100 g was dissolved in type I water and then quantitatively filtered through a Whatman #1 filter paper into a clean 100 ml volumetric flask. The flask was then made up to volume with type I water and mixed thoroughly.A portion of the solution was filtered through a 0.45 um filter into a sample vial for analysis. Analysis of the sample gave a fluoride concentration of 1.60 mg/l Calculate the % w/w fluoride in the original toothpaste sample. (Give your answer to 3 decimal places please)

When a Vitamin C (ascorbic acid; MM = 176.12 g mol-1) tablet is crushed, dissolved and titrated with 0.0377  M KIO3(aq) to a purple/blue endpoint (given by a starch indicator), the volume of KIO3 used is 40.01 mL.  How many mg of Vitamin C were in the tablet? KIO3(aq) + 5 KI + 6 H+ → 3 I2(aq) + 3 H2O I2 (aq) + ascorbic acid → 2 I- + dehydroascorbic acid