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# Molar Concentrations

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Calculate the molar concentrations, I-, disulfur octaoxide, disulfur trioxide.
From [stock concentrations] 15 ml of .20 M potassium iodine, 20 ml of .10M K2S2O8, and 10 ml of .0050M Na2S2O3, I am supposed to figure out the molar concentrations of I-, disulfur octaoxide, and disulfur trioxide.

First I thought just use the concentration and volume of each stock concentration to find the moles...but I got stock. How do I use the information I wrote down to figure how to find the molar concentrations of the above. :(

https://brainmass.com/chemistry/physical-chemistry/molar-concentrations-135802

#### Solution Preview

What you need to do is find the moles of each, like you stated.
Then you need ...

#### Solution Summary

From [stock concentrations] 15 ml of .20 M potassium iodine, 20 ml of .10M K2S2O8, and 10 ml of .0050M Na2S2O3, I am supposed to figure out the molar concentrations of I-, disulfur octaoxide, and disulfur trioxide.

\$2.19

## pH and molar concentration of hydrogen ion

1.Given the molar concentration of hydrogen ion [H+] = 6.2 x 10 -7, calculate the concentration of hydroxide ion.

2.Given the molar concentration of hydroxide ion [OH -] = 4.6 X 10 -13, calculate the concentration of hydrogen ion.

3. In 1 mL of water there are 3 X 1022 molecules of H2O. How many hydrogen ions are in 1 mL of water (Hint: In 1 billion water molecules, only 2 are ionized).

4. What is the pH of a 0.25 M NaOH solution?

5. A Rolaids tablet contains calcium carbonate, which neutralizes stomach acid. If 44.55 mL of 0.488 M hydrochloric acid is required to neutralize one tablet, how many milligrams of calcium carbonate are in a Rolaids tablet?

CaCO3.(s) + 2 HCl(aq) ® CaCl2(aq) + H2O(l) + CO2(g)

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