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Mr_Saturn512's avatar

How do I make .1N solution of NaOH?

Asked by Mr_Saturn512 (477points) March 10th, 2015

Boss needs me to do this. Chemistry isn’t my strong point but he doesn’t know that.

I don’t need a lot, just a small amount. So like 1mL. He wants me to make a .1N solution of 1.5M NaOH. I was trying to find in the lab what I could start with and found some 6N NaOH. I’ve never dealt with Normality before so I’m not sure how to treat this. Do I just dilute the 6N NaOH to make it .1N? What do I dilute it with? But wait – how do I make sure it’s 1.5M? It doesn’t read on there the Molarity, so should I just start from scratch with some raw material?

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10 Answers

cazzie's avatar

NaOH is Sodium Hydroxide… or otherwise known as lye. I create a solution of Sodium Hydroxide all the time. Is this for cleaning purposes? For what are you making the solution for? How accurate does the solution really need to be?

cazzie's avatar

If you dilute it you need to dilute with pure water. Let’s see if this rings any chemistry lab bells you may have taken in college…. http://iweb.tntech.edu/bjackson/Chem1210/Notes/Lecture8.htm

gondwanalon's avatar

In the case of NaOH a one molar solution is the same as a one normal solution. So 1.5M NaOH = 1.5N NaOH.

Therefore simply take 100uL of the 1.5N NaOH and add it to 14.9mL of distilled H20. You’ll have 15 mL of a 0.1N NaOH solution.

cazzie's avatar

Thank you, @gondwanalon I knew that NaOH was a simple situation, but I lack the technical vocabulary. I only use a percentage solution for saponification, so certainly too roughly speaking for the poster.

Mr_Saturn512's avatar

I know NaOH is Sodium Hydroxide (I’m not THAT chemistry illiterate. . )

A friend told me though that for NaOH the Normality is equal to Molarity, just like @gondwanalon said. So this 6N solution of NaOH I found is really also just 6M. So how is it possible that I can make a .1N NaOH solution at 1.5M? That’s basically asking for two different things to exist as one. I don’t know if I then misheard my boss but I even wrote down in his words ”.1N NaOH at 1.5M”. Unless he meant different terminology.

I’m using it as an elution buffer for a spin column. I’m not at liberty to say much more than that.

Mr_Saturn512's avatar

He also mentioned how I should store it in a plastic bottle because NaOH in glass apparently doesn’t bode well. He explained but I forgot – all I wrote was “put in plastic bottle”. So he WAS talking about NaOH, right?

cazzie's avatar

It depends on the solution, but NaOH will etch (react) with glass. I mix it in about a 28% solution in lab glass and I don’t store it. It gets mixed within minutes of it being mixed. If I had to store it, it would go into a PET plastic. Strong NaOH solutions will eat at glass.

gondwanalon's avatar

I understand from what you wrote that your boss wants a small amount of 0.1N NaOH. How you get it seems to be the problem. I would question your boss further about the “make a .1N NaOH solution at 1.5M”. Ask your boss if he/she means: make the 0.1N solution FROM the 1.5M solution? That’s what I’m thinking that your boss meant to say.

Mr_Saturn512's avatar

Yeah but we’ve got no other NaOH solution around except that big 1L of 6N. All the NaOH solutions made come from that bottle. Nevertheless, I’ll know tomorrow what he really meant.

gondwanalon's avatar

Another guess is that your boss wants you to make up a large quantity of 1.5M NaOH (from the 6N NaOH). Then from 1.5M solution make up a small amount of 0.1N NaOH.

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