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HCL dilution...
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posted
hello all,

here in montreal getting the right supplies can be challenging and the closest i can get to HCL 0.1N

SO IF I WANT TO GET TO THE PROPER RATIO OF 0.01N

* DO I ADD 10ML TO 1L OF DISTILLED WATER OR SOME OTHER CHEMICAL *

EVAN


Jetta 2002 ; 6 hole nozzles, chip, yellow koni, gli springs, neuspeed RR sway bar, skid plate, SS brakes, TT shifter, TT bushings, GTi FR brakes
Jetta 2006 chipped, Bilstein Sport, Neuspeed Sport Springs, Neuspeed endlinks, DG SS, Evolution skid plate, Eibach RSB, B100
 
Location: Montreal | Registered: August 06, 2005Reply With QuoteReport This Post
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quote:
Originally posted by evangelos:
hello all,

here in montreal getting the right supplies can be challenging and the closest i can get to HCL 0.1N

SO IF I WANT TO GET TO THE PROPER RATIO OF 0.01N

* DO I ADD 10ML TO 1L OF DISTILLED WATER OR SOME OTHER CHEMICAL *

EVAN

Hi,
A 1N solution= 36.5 g HCl/litre water
0.1N solution= 3.65g HCl/litre water
0.01N solution= 0.365g HCl/litre water

So to make your 0.1N into 0.01N take 100mls of your 0.1N and make up to 1 Litre using pure water(distilled or deionised)-0r take 10ml and make up to 100ml
Hope this helps
 
Location: UK | Registered: October 14, 2008Reply With QuoteReport This Post
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ALRIGHT, SO IF I CAN DUMMY IT DOWN A BIT YOU ARE ARE SAYING 100ML TO BE ADDED TO 1L of distilled water - THAT IS GREAT I HAVE THAT.

BUT

TO MAKE A SMALLER PORTION AS WE DO NOT USE MUCH OF IT TAKE 10ML AND MIX WITH 100ML OF DISTILLED WATER.

I AM SURE I GOT IT BUT I STILL DUMMY DOWN CONFIRMATION.

THANKS

EVAN


Jetta 2002 ; 6 hole nozzles, chip, yellow koni, gli springs, neuspeed RR sway bar, skid plate, SS brakes, TT shifter, TT bushings, GTi FR brakes
Jetta 2006 chipped, Bilstein Sport, Neuspeed Sport Springs, Neuspeed endlinks, DG SS, Evolution skid plate, Eibach RSB, B100
 
Location: Montreal | Registered: August 06, 2005Reply With QuoteReport This Post
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Hi Evan,
Lose the capitals, it is considered yelling when posting online.
Here is the instructions from the biodieseltutorial.org website;
quote:
Using Hardware store 'Muriatic Acid' as your source of hydrochloric acid:

'Muriatic acid' is HCL, sold in hardware stores for swimming pool maintenance and for concrete etching, about $3 a gallon. Muriatic acid varies slightly in strength. It is labeled on the bottle with the percentage concentration, usually somewhere around 30%.

Here's how to make a 0.01N concentration of this acid for the titration (assuming the label is correct and you've kept the bottle sealed):

1N- 1 mol HCL/liter (ie 1 mole of H+)
1 mol HCL is 36.5 grams

To make 1 liter of the 0.01N HCL solution that we need, we want to have 0.01 moles of HCL in 1 liter of solution
0.01 moles of HCL is .365 grams (0.01mol/L) (1L)

Find the percentage concentration on the bottle (it'll be close to 30%, probably 31.45%).

We want to know how much volume in milliliters to use of this (approximately 30g per 100 ml) hardware store acid to make up 0.365 grams for our 0.01N solution.

The formula is for finding the number of milliliters is:
[edit: these are the corrected numbers I think: x= (0.365 x 100) / percentage from the bottle . See several posts down for more information]

X [which is milliliters to use] = 0.365g / ( (percentage HCL in g) (100 ml))

Substitute the actual percentage from the bottle (ie 30.7 or 29.24 or whatever it says)

This will tell you a very tiny number, like 1.88 milliliters. You can do one of two things:

1. Measure out the x of hydrochloric acid, and make up a solution of 1 liter of distilled water and this x ml of your hydrochloric acid. This is a .01N solution. To make the solution, first add acid to a graduated cylinder filled with half a liter of water, then add enough water to make up the volume to exactly 1000 ml including the acid.

2. or, you can make a stock solution in order to get a more precise measurement:
We sometimes make a stock solution when measuring out tiny amounts of a liquid for titration reagent, in order to be more accurate with our measurements. In the case of the hydrochloric, I for example might need 1.8 ml to end up in 1000 ml of water. This is a tiny amount of liquid and if I make a mistake here it'll have a large impact on the chemistry.

We can be more accurate by making up our .01N HCL solution in two steps- first measure ten times the smaller amount of the substance as usual, (for instance it is easier to measure 18 ml than to measure 1.8 ml) and then add this to 982 ml distilled water [edit: it's probably going to actually be 11.6 ml of acid, going into about 988 ml of water, if your acid is of 31.45% strength which is common]. You will have a concentrated reagent that is 10 times as strong as what you need for the titration. You can then make up working dilutions of it by diluting some of this stock with further distilled water: take 10 ml of stock solution, and add 100 ml [edit: should be 90 ml] of distilled water. Work from this .01N solution for the titration above.

Once again, stock solution instructions:
Step one, make stock solution:
Take 10 times X ml of hydrochloric (from calculation in the box above), with distilled water added to make up a total of 1 liter of stock solution. This violates the usual instructions to not add water to acid, so please put some of the water into the flask first and THEN add the acid
Label the bottle clearly as 'stock solution' with the strength marked

step two, 1 in 10 dilution:
dilute this by taking 10 ml of this stock solution, add 90 ml of distilled water. This is now a 0.01N solution which you can use for the titration. Label the bottle clearly as '0.01N solution'.


Good luck!
Jon
 
Location: Wellington County, Ontario Canada | Registered: February 07, 2008Reply With QuoteReport This Post
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well,

this is what i found:



Name % TLV Units

Hydrochloric acid: 0.314% TWA: 5 ppm (HCI)
Water: 99.68% N/A


purchased for us Canadians: link

Data sheet: data sheet

thanks for all the help.

Evan


Jetta 2002 ; 6 hole nozzles, chip, yellow koni, gli springs, neuspeed RR sway bar, skid plate, SS brakes, TT shifter, TT bushings, GTi FR brakes
Jetta 2006 chipped, Bilstein Sport, Neuspeed Sport Springs, Neuspeed endlinks, DG SS, Evolution skid plate, Eibach RSB, B100
 
Location: Montreal | Registered: August 06, 2005Reply With QuoteReport This Post
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Hi Evan
Your dilution should be: 10ml of your 0.1N HCl + 90 ml water...total volume 100ml (after mixing)
or: 100ml of your 0.1N HCl + 900 ml water..total volume 1000ml (after mixing)
This will give you your 0.01N solution(0.01M "Molar"solution is the new term).It is important that the solution is made in terms of"grams per litre" and not grams added "to a litre" as this would make the final volume more than a litre and this would not be correct.
Good Luck
 
Location: UK | Registered: October 14, 2008Reply With QuoteReport This Post



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That looks like the right stuff to me, it states;
quote:
Laboratory, Solution, 0.1M (0.1M=0.1N)

So just dilute it to the .01N solution that you need as per taralec's post above.
Cheers,
Jon
 
Location: Wellington County, Ontario Canada | Registered: February 07, 2008Reply With QuoteReport This Post
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Forgot to add,for safe practice, you should always add acid to water,(heats up)and not the other way round-So in this instance,assuming you want to make up 100mls put around 80 mls water in your measuring cylinder ,add your 10mls 0.1N HCl stir and make up to 100ml mark with water.
 
Location: UK | Registered: October 14, 2008Reply With QuoteReport This Post
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thanks for the help...


i love this forum Smile
 
Location: Montreal | Registered: August 06, 2005Reply With QuoteReport This Post
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I haven't had any luck testing my lye solution with my homemade .01N HCI solution. With stories bought muriatic acid of 31.45%. I mixed exactly one liter of distilled water with 1.16 ml of acid. And then took 10 ml of HCI with 10 ml of distilled water with a few drops of pheylphaline. And dropped my titration solution in until it turned pink. Which only took 1.5 ml. And when I divide 4 by 1.5. I get 2.66. I thought it was supposed to be less than 1. Where did I go wrong?
 
Registered: September 23, 2014Reply With QuoteReport This Post
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Hi CB,
I am not sure what you are trying to achieve?
Please give us some more details about what you are trying to do.
Cheers,
Jon
 
Location: Wellington County, Ontario Canada | Registered: February 07, 2008Reply With QuoteReport This Post
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