sodium hydrogensulfate

Hi all,

I am currently setting up the first a level chemistry required practical. "Make up a volumetric solution and carry out a simple acid-base titration"

We ordered in sodium hydrogensulfate, but it's in huge lumps that I can't break up. The students need to make up their own solutions but can't possibly with this.

Am I missing something?

Did I order the wrong thing?

Help please!!
 
Last edited:

007

COMMITTEE
Hi all,

I am currently setting up the first required practical.

We ordered in sodium hydrogensulfate, but it's in huge lumps that I can't break up. The students need to make up their own solutions but can't possibly with this.

Am I missing something?

Did I order the wrong thing?

Help please!!
It's moderately soluble in water as far as I'm aware about 30g per 100 ml of water. As I don't know which practical you are setting up, I've always used sodium carbonate to make a solution and then titrated this against HCl using methyl orange as an indicator. (we don't use the really cheap sodium carbonate powder used for chemical disposal, as this produces cloudy solutions, I use specially bought for this activity.)

For best groups I get them to make NaOH standard solutions of 0.25M and titrate against HCl using phenolphthalein as the indicator.

Never had any problems using either.
 
It's moderately soluble in water as far as I'm aware about 30g per 100 ml of water. As I don't know which practical you are setting up, I've always used sodium carbonate to make a solution and then titrated this against HCl using methyl orange as an indicator. (we don't use the really cheap sodium carbonate powder used for chemical disposal, as this produces cloudy solutions, I use specially bought for this activity.)

For best groups I get them to make NaOH standard solutions of 0.25M and titrate against HCl using phenolphthalein as the indicator.

Never had any problems using either.
Hello sorry I forgot to say this is for the first A Level required practical! Posted in a bit of a rush!

We want to titrate sodium hydroxide and sodium hydrogen sulfate, with the students making up their own solution of sodium hydrogen sulfate.

The practical is tomorrow and i've just opened up the bottle to see that the sodium hydrogen sulfate is in huge lumps!
 

007

COMMITTEE
Hello sorry I forgot to say this is for the first A Level required practical! Posted in a bit of a rush!

We want to titrate sodium hydroxide and sodium hydrogen sulfate, with the students making up their own solution of sodium hydrogen sulfate.

The practical is tomorrow and i've just opened up the bottle to see that the sodium hydrogen sulfate is in huge lumps!
Remember you can alter these practicals to suit your availability as long as the same skills are being carried out so I would use sodium carbonate instead. I had an OCR practical endorsement visit last year and they had no issues with me using sodium carbonate instead of the suggested chemical in their notes.
 
Just had a quick look at better equipped - they spelt 'sulfate' with a 'ph' which is a bit worrying
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You've got the fused form which is the only one they do but should be able to break it up with a mortar and pestle.

Most other suppliers sell the powdered form
 
Last edited:
Hi all,

I am currently setting up the first a level chemistry required practical. "Make up a volumetric solution and carry out a simple acid-base titration"

We ordered in sodium hydrogensulfate, but it's in huge lumps that I can't break up. The students need to make up their own solutions but can't possibly with this.

Am I missing something?

Did I order the wrong thing?

Help please!!
It's moderately soluble in water as far as I'm aware about 30g per 100 ml of water. As I don't know which practical you are setting up, I've always used sodium carbonate to make a solution and then titrated this against HCl using methyl orange as an indicator. (we don't use the really cheap sodium carbonate powder used for chemical disposal, as this produces cloudy solutions, I use specially bought for this activity.)

For best groups I get them to make NaOH standard solutions of 0.25M and titrate against HCl using phenolphthalein as the indicator.

Never had any problems using either.
The whole point of the exercise is to standardise the Sodium Hydroxide with a Primary standard - Sodium Hydrogen Sulfate. Could also have used Sulfamic Acid. As for the dissolution, you could have ground down the lumps into powder then heated in an oven to make sure it's dry before weighing.
 
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