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Problem- What mass of riboflavin (in mg) must be dissolved in 0.02 M acetic acid solution (Solution #1, assume density is 1.0 g/mL) to create 500 mL of a 50.0 ppm standard solution of riboflavin (Solution #2)?
Determine the volume of Solution #2 that is needed to make 25.00 mL of 2ppm solution?
Calculate the percent riboflavin (to 3 significant figures) in a 50 mg multivitamin that was dissolved in 250 mL of 0.02 M acetic acid (assume density of acetic acid = 1 g/mL), given the fluorescence of the multivitamin is 0.142.
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170 ml of an hcl solution with ph of 2.30 is added to 200 ml of an hno3 solution. the resulting ph is 1.40. what was
how much aspirin is recovered? Solubility of aspirin in water at 25oC is one gram of aspirin per 300 milliliters of water.
Draw the skeletal structure for major organic product produced when the arene given reacts with 2 equivalents each of Na and HOCH3.
Explain what color change is exhibited by phenolphthalein during a titration of aqueous acetic acid with aqueous sodium hydroxide
Consider the balanced chemical reaction shown: 4PH^3 (g) + 8O^2 (g) ---> 6H^2O (l) + 1P^4O^10 (s) In a certain experiment, 8.92g of PH^3 reacts with 9.60g of O^2(g)
Combine the above two equations with that for the formation of liquid water and use addition and/or subtraction(i.e. Hess's Law) to arrive at the equation for the formation of magnesium oxide.
Given: Volume of He sample = 72.5mL Temperature = 30 C Atmospheric pressure = 785 mmHg Equilibrium vapor pressure of water at 30 C = 31.88 mmHg What is the ratio of average molecular velocity between He(g) and H2O(g)
For a reaction where the general form of the rate law is = [A]m[B]n, the subsequent data were collected. Explain what is the order of the reaction with respect to A. Explain what is the order of the reaction with respect to B
A solution is prepared from 4.5729g of magnesium chloride and 43.244g of water. The vapor pressure of water above this solution is found to be 0.3628atm at 348.0 K. The vapor pressure of pure water at this temperature is 0.3804 atm.
When 2.45g of an unknown weak acid (HA) with a molar mass of 85.0 g/mol is dissolved in 250.0 g of water, the freezing point of the resulting solution is -0.255 C. Calculate Ka for the unknown weak acid.
Question- Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 1.20 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 °C? Use ..
Problem- A weak monoprotic acid solution of 25.00 mL of an unknown concentration is titrated to the equivalence point with 35.86 mL of 0.08728 M NaOH.
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