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# Converting concentrations to find amount needed from stock Watch

1. Hi all really stuck on this question. Any help appreciated.

I have 37% HCL stock solution. I want to know how much of this stock I need to produce 1L of 0.1M.

I need this for my lab project so help will be immensely appreciated.
2. (Original post by Student21)
Hi all really stuck on this question. Any help appreciated.

I have 37% HCL stock solution. I want to know how much of this stock I need to produce 1L of 0.1M.

I need this for my lab project so help will be immensely appreciated.
I have to assume that it's 37% w/v.

So that there is 37 g in 100 ml of solution

So there is 370g in 1 litre of solution.

To make a 0.1 M solution you need 3.646 g of HCl in 1 litre of solution.

Hence you need to extract 3.646/370 litres of solution and make it up to 1 litre using distilled water.

Updated: October 17, 2016
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