Blue #1 is an FDA approved dye with the formula C37H34N2NA2O9S3. A stock solution is prepared by adding 55.0 mg of Blue #1 to enough water to prepare 250.0 ml of solution. A working solution is prepared by diluting 10.0 ml of the stock solution to a final volume of 500.0 ml. Calculate the concentration of the working solution in mol/L.

2. a) 25mL of water is added to 125mL of 1 0.15mol/L NaOH solution, what is the concentration of the diluted solution? b) What volume of 0.05mol/L HCl solution is made by diluting 250mL of 10.0mol/L HOCI?

How many grams of Na2SO4 would you need to dissolve in 1.40 L of water in order to create a solution with a concentration of ions equal to 0.725 m? The density of water at this temperature is 0.9881 g/mL

A 10.00 ml sample of a solution of hydrofluoric acid, HF, is diluted to 500.00 ml. A 20.00 ml aliquot of the diluted solution requires 13.51 ml of a 0.1500 M NaOH solution to be titrated to the equivalence point. What is the normality of the original HF solution? HF+OH → F + H₂O

In a lab, you diluted a sample of bleach to 1/10 concentration in a 250 volumetric flask. Then quantitatively transferred 25 ml of the 1/10 concentration diluted bleach into a beaker and titrated it with a standard sodium thiosulfate solution that has a molarity of 0.1215M. You repeated this 3 times. The data below is the amount of sodium thiosulfate that was titrated in the 3 runs. Calculate the molarity in each run of the diluted bleach and the concentration of undiluted bleach sample. Titration 1: 45.55 ml Titration 2: 45.67 ml Titration 6: 45.58 ml

What mass of NaOHNaOH is needed to precipitate the Cd2+Cd2+ ions from 34.0 mLmL of 0.470 MM Cd(NO3)2Cd(NO3)2 solution?

The concentration of magnesium ions in seawater is approximately 0.0541 M. To the solution in part 3 above with MgSO4•7H2O (Epsoms Salt), how many more grams of MgCl2•6H2O will you need to use to make 1.0 L of water with the same concentration of magnesium ions as seawater?     (I am reasking this question since the one I posted was never answered, how do I cancel the previous, duplicate question please?)

To what volume (in mL) must 27.4 mL of 17.2 M H2SO4 be diluted to produce 1.43 M H2SO4?

50 g of pure Na2CO3 were dissolved in water and the volume of this solution was 200 mL. To this solution, 500 mL of 0.10 M HCl solution were added. Calculate the followings:                                                     Moles of Na2CO3 left unreacted Molarity of Na2CO3 solution after the reaction

5.00 mL of acetic acid required 37.28 mL of 0.0999 M NaOH to be neutralized in a titration. Calculate the molarity of vinegar.