Chemistry Coursework nuffield - can someone check plz?

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Robinb
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Report Thread starter 16 years ago
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As part of the cousework - we have been asked to create our own concentrations with hydrocloric acid and react with Magnesium (gar produced). I just want to check these workings: and can someone tell me if I an correct or incorrect:

Lets say I have 1M HCL
I ahve a 200ml volumetric flask

To create 0.2M - I would split the 200 by 10 parts - 2 parts of HCL - the other 8 parts of Pure Water

Each part in this case would be 20ml - a pittette would do that.

For 0.4, it would be 4 parts acid, 6 parts pure water

for 0.6M 6 parts acid, 4 parts water

0.8M 8 parts acid 2 parts Water.

and 1M it would be silly to use pure water


If one or two people could comferm my workings, that would be great.

Cheers.

Robinb


one other thing - the glass syniges - they often get stuck and reck the results (as one person found out when the stopper of the experiment went out the window at high velocity as of a gas pressure buildup). Is there any way to make these less stiff, or is there another apperatous to use?

thanks you very much

Robinb
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bad gal
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Report 16 years ago
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(Original post by Robinb)
As part of the cousework - we have been asked to create our own concentrations with hydrocloric acid and react with Magnesium (gar produced). I just want to check these workings: and can someone tell me if I an correct or incorrect:

Lets say I have 1M HCL
I ahve a 200ml volumetric flask

To create 0.2M - I would split the 200 by 10 parts - 2 parts of HCL - the other 8 parts of Pure Water

Each part in this case would be 20ml - a pittette would do that.

For 0.4, it would be 4 parts acid, 6 parts pure water

for 0.6M 6 parts acid, 4 parts water

0.8M 8 parts acid 2 parts Water.

and 1M it would be silly to use pure water


If one or two people could comferm my workings, that would be great.

Cheers.

Robinb


one other thing - the glass syniges - they often get stuck and reck the results (as one person found out when the stopper of the experiment went out the window at high velocity as of a gas pressure buildup). Is there any way to make these less stiff, or is there another apperatous to use?

thanks you very much

Robinb
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bad gal
Badges: 0
#3
Report 16 years ago
#3
(Original post by Robinb)
As part of the cousework - we have been asked to create our own concentrations with hydrocloric acid and react with Magnesium (gar produced). I just want to check these workings: and can someone tell me if I an correct or incorrect:

Lets say I have 1M HCL
I ahve a 200ml volumetric flask

To create 0.2M - I would split the 200 by 10 parts - 2 parts of HCL - the other 8 parts of Pure Water

Each part in this case would be 20ml - a pittette would do that.

For 0.4, it would be 4 parts acid, 6 parts pure water

for 0.6M 6 parts acid, 4 parts water

0.8M 8 parts acid 2 parts Water.

and 1M it would be silly to use pure water


If one or two people could comferm my workings, that would be great.

Cheers.

Robinb


one other thing - the glass syniges - they often get stuck and reck the results (as one person found out when the stopper of the experiment went out the window at high velocity as of a gas pressure buildup). Is there any way to make these less stiff, or is there another apperatous to use?

thanks you very much

Robinb
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