Acid Test Kit - Refill

Several months a go I purchased an Acid Test "kit". A few months ago I purchased another Acid Test "kit" from a different retailer. The first one had Sodium Hydroxide solution of N/10 and the Phenolphthalein was 1%. The 2nd kit had Sodium Hydroxide solution of

1/5N and the Phenolphthalein appears to also be 1%.

The calculation needed to arrive at the acid percent is different between the two kits ... I assume due primarily to double strength of the Sodium Hydroxide solution in the 2nd kit.

I have run out of the Sodium Hydroxide solution in both kits but I still have lots of the Phenolphthalein solution. I'd like to order just the chemicals rather than the "kits" due to lower price and larger quantities. It looks like the Phenolphthalein solutions are the same.

My question is can I continue to use the Phenolphthalein solution that I still have regardless of the Sodium Hydroxide solution strength that I order? Do these chemicals have a shelf life (or do they keep for at least a few years)?

Thanks again for your feedback.

Roger L. Pelletier , Aurora, NE USA

Reply to
Wino-Nouveau
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Roger-

What you're asking is entirely possible. The solutions you're referring to are 'normal' and not 'molar' solutions- that would be the only little surprise you'd see.

You can make your own solutions fairly easily- see

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at the bottom you'll see a description of how to make them. Basically Normal solutions are easier to make- they weigh/volume out the water and then add the chemical. Molar solutions are made 'to volume', meaning they add the chemical and then dilute to EXACTLY the required volume. See the difference?

So a N/10 (1/10th Normal Solution) of NaOH would require 1/10th equivelent of 1 Mole of hydroxide ion, which means 1/10th of 40g/1OH 4g per Litre water. See

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If I've thoroughly c> Several months a go I purchased an Acid Test "kit". A few months

Reply to
purduephotog2

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