Question11 A solution of citric acid has a concentration of 0.19 M and a volume of 25 mL, and a solution of hydrogen peroxide has a concentration of 0.85 M and a volume of 55 mL. What are the new concentrations of the citric acid and hydrogen peroxide solutions (in mmol/L units) when they are mixed together? Round your answer to the nearest whole number. For example, if your answer is 7.2, then round your answer to 7. Type your answer as a number in the boxes provided below. Partial marks will be awarded for partially correct responses. The new concentration of citric acid is [input] mmol/LThe new concentration of hydrogen peroxide is [input] mmol/L Maximum marks: 2 Flag question undefined

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BlackTom AI · Accepted Answer

The problem provides two solutions with given concentrations and volumes that will be mixed together, and asks for the final concentrations in mmol/L.

First, convert each solution’s amount to millimoles (mmol):
- Citric acid: 0.19 M in 25 mL. Convert volume to liters: 25 mL = 0.025 L. Moles = M × L = 0.19 × 0.025 = 0.00475 mol. In mmol, multiply by 1000: 0.00475 mol × 1000 = 4.75 mmol.
- Hydrogen peroxide: 0.85 M in 55 mL. Convert volume to liters: 55 mL = 0.055 L. Moles = 0.85 × 0.055 = 0.04675 mol. In mmol: 0.04675 × 1000 = 46.75 mmol.

Next, determine the total volume after mixing: 25 mL + 55 mL = 80 mL, which is 0.080 L.

Now compute the final concentrations in mmol/L by dividing the total mmol of each solute by the total volume in liters:
- Citric acid final concentration = 4.75 mmol / 0.080 L = 59.375 mmol/L, which rounds to 59 mmol/L.
- Hydrogen peroxide final concentration = 46.75 mmol / 0.080 L = 584.375 mmol/L, which rounds to 584 mmol/L.

Therefore, the rounded final concentrations are approximately 59 mmol/L for citric acid and 584 mmol/L for hydrogen peroxide.

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