How many MILLILITERS of lactic acid and GRAMS of sodium lactate must be added to 1L of water to produce a solution with pH 3.9 and a total solute concentration of 1 mM? (MW Salt = 112.06; MW Acid = 90.08)

If 35.12 mL of 0.4221 M NaOH is needed to fully titrate a solution made with 0.7737 g of a diprotic acid, what is the experimental molar mass of the acid?     91.73 g/mol     120.9 g/mol     53.77 g/mol     104.4 g/mol     41.60 g/mol

How many grams of citric acid and sodium citrate dihydrate must be added to 1L of water to produce a solution with pH 3.9 and a total solute concentration of 1 mM? (MW Salt = 294.09; MW Acid = 192.13) I found the answer below, but my calculation does not match it. Can you please show me in detail how the calculation from the image below was done? How did they get the amount of citric acid and citrate?  Please make sure that you get the same result and the calculation is completely detailed.

what items... Lowest concentration of free hydrogen in solution? Contains the greatest concentration of H+ in solution?` Would serve to buffer both acidic and basic solutions?

The chemical 5-amino-2,3-dihydro-1,4- phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic solution of luminol is often sprayed onto surfaces that are suspected of containing minute amounts of blood. Luminol has a molecular weight of 177 g/mol. The forensic technician at a crime scene has just prepared a luminol stock solution by adding 17.0 g of luminol into a total volume of 75.0 mL of H₂O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units. ► View Available Hint(s) molarity of luminol solution = 1.28 M Submit Correct Part B Previous Answers Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00 × 10-2 M. The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many…

Answer in scientific notation with appropriate sigfigs.  A buffer solution is prepared by combining (1.2x10^1) mL of (2.50x10^-1) molar acetic acid with (1.900x10^1) mL of (2.40x10^-1) molar sodium acetate. What is the concentration of weak acid in this solution? Note: Your answer is assumed to be reduced to the highest power possible.