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You would need to use at least a reagent grade of any soluble phosphate containing chemical you already have or can access. All the McTogi resources are word documents on CD and the one off cost entitles the institution to lifetime photocopy rights of the resource — including the opportunity to modify each resource such as student notes to meet you particular needs e.

We hope you enjoy visiting our website and are pleased to serve you on every purchase you make. Otherwise it seems that it would be acceptable which it is not to use a testing kit of same kind as this would be considered comparable.

As this is a back titration you may effectively be getting a null result because little or no Vit C is present in the sample. I think that it's a shame that the requirement have moved away from eg, testing the vitamin C content of a range of orange juices to those that involve a trend such as the change in vitamin C content with increasing temperature.

One of our Chemistry teachers was told as a student that silver nitrate was one of the most accurate primary standards but that doesn't seem to be a widely accepted theory. The drugs are then posted to the purchaser who will receive nothing more than a bag of pills or powder and a receipt.

Would I be able to join this please. I can find no reference in the standard itself or the moderator's report to a minimum of 5 being a suitable range for merit, and would assume I am not the only person to be caught out by this. Research chemicals get popular day after day because of the way they are made and distributed throughout the world.

The overall grade should be a holistic judgement and the check list approach is there for convenience and to provide some guidance but is not expected to be cut and dried.

However, as the requirements have changed we're finding it difficult to assist our students with recommendations involving trends.

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I wonder if you can help me with the following. Independent and Unbiased advice Here at MethSafe, we have always remained independent from all conflicts of interest. We then allocate a 3 week continuous block of time during which they carry out the actual practical work.

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This may or may not be a good thing as preparation can sometimes take a long time or may be difficult to perform. They fit into the grey zone between illegal and legal thus they are being advertised online. We used 3 samples of each egg brown and white and then 3 samples from each of those eggs.

The choice of variable depends on the purpose of the investigation. Personally I think the elimination of EDTA type titrations would be a shame but I can't think of any variation that could be usefully investigated wrt Ca or Al et al. Just left at room temperature it is more likely to be days although I do know that vegetables such as sweet corn lose about half their Vit C within hours of being picked.

At the concentrations used for these titrations there is no way the eye will pick up any colour of the resulting manganous ion so the end point is effectively colourless.

What amount of teacher assistance can be tolerated during the investigation. Haven't come across it at all before so don't know how the moderation process would handle it. We have had a look in all our books and have been unable to find anything. Just have a few more questions about 3.

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We are impartial, we want to succeed in 1 year to list all existing research chemicals. For this very complicated work we employ 6 chemists. Buy research chemicals UK.

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