Hydrochloric acid is purchased in 12 molar concentrations. If I needed 200 ml of 2.0 molar HCl, how many milliliters of the concentrated solution would I need

The answer to your question is 33.3 ml

Explanation:

Data

Stock solution 12M

Volume 2 = 200 ml

Concentration 2 = 2 M

Volume stock = ?

Process

1.- Use the formula for dilutions

                               C1V1 = C2 V2

- Solve for V1

                               V1 = C2V2 / C1

2.- Substitution

                               V1 = (2)(200) / 12

- Simplification

                               V1 = 400 / 12

3.- Result

                               V1 = 33.3 ml

4.- Conclusion

We need 33.3 ml of the concentrated solution.

answer; protein;

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.