Q&A for How to Calculate the Concentration of a Solution

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How do I convert milligrams to moles?

Community Answer

First, calculate the molar mass of your substance. (Add the atomic masses of the constituent elements.) Then, convert milligrams to grams by dividing by 1000. Finally, divide the grams of your substance by the Molar Mass.

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Question

If I have a solution with unknown mass, how do I calculate concentration?

Community Answer

Calculate the number of moles using the equation c=n/v for the first given solution.Then using the no of moles calculate the mass using equation n=m/Mr.

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If I am given two solutions, what is one way of knowing which one is more/less concentrated?

Community Answer

You can perform titrations. Under the Le Chatelier's principle, the more concentrated one will have faster reacting time due to the fact that the more concentrated one has more molecules of that substance, leading to the ultimate truth that the chances of molecules meeting each other is bigger. Note that this method will not work if you are dropping Transition Metals into room-temperature, concentrated HNO3 or H2SO4 since Iron (and other metals) has the property called passivation. It happens when the metal reacts w/ the acid so quickly that the metal forms a salt, preventing the further reaction to the acid.

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Is it possible to learn chemistry when you are young? I might be young but I'm smart.

Community Answer

Yes it is certainly possible to learn chemistry at an early age - where there is interest, there is always a chance to learn well. Borrow books from your local library (chemistry books are usually quite expensive) or ask for a young person's book about chemistry or the elements for a birthday gift. Keep notes of your learning and work your way up to doing safe experiments at home (look for children's science experiment books in the library). You can also find chemistry apps for your tablet device.

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How do I prepare sodium acetate?

Community Answer

To prepare 1,000 ml of the acetate buffer solution, 150 g of sodium acetate is dissolved in ~250 ml of distilled water. Exactly 15 ml of glacial acetic acid is then added very slowly into the sodium acetate aqueous solution. Finally, distilled water is added into the solution to fill the volume.

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How do I calculate the density of a solution?

Community Answer

Here is the formula: P = M/V where P = density, M = mass and V = volume of the substance.

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