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Chemistry help needed: Preparing a standard solution.?
Hello, I need to find out the amount of of NaOH needed to prepare a standard solution. This is the information I have been given.
I am to use a 500cm^3 flask.
The molar mass of NaOH is 40
I do not have the concentration of NaOH, so have no idea how to solve this. Please help!
@ Kumorifox
I know, I thought it was impossible, maybe I have not given you enough information (i do not have the concentration though.) I will revise my question
This is 12th grade high school chemistry by the way.
I need to use the standard solution, in conjunction with Phenolphthalein to discover the concentration of an amount HCl, by dripping it into the solution until the indicator indicates a neutral solution.
This all falls part of an experiment to determine the effect of concentration of HCl on its reaction with thiosulphate, (the thiosulphate solution has a concentration of 0,5 mol.dm^-3)
And basically that's it
1 Answer
- kumorifoxLv 71 decade agoFavorite Answer
This makes no sense. For a standard solution concentration is a vital piece of information. Otherwise, it's not possible to make a standard.
You can assume a concentration in such a case. If you have to make up a 0.1M solution, you multiply the molar mass by 0.1 to get the mass required for 1 L, then divide by the appropriate factor to get to 500 cm³. For a 1M solution, do the same, just multiply the molar mass by 1. You can always dilute a concentrated solution further; concentrating a dilute solution is extremely difficult to do accurately.