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density of khp
Potassium hydrogen phthalate, sometimes called simply “KHP,” is an acidic salt compound. It forms white powder, colorless crystals, a colorless solution, and an ionic solid that is the monopotassium salt of phthalic acid.
It is a good titration standard for acids and bases because it is air-stable and does not become hygroscopic. It is also a good thermogravimetric standard because its pH is very stable in solution and it does not degrade or hydrate under thermal conditions.
When it is used as an acidimetric standard, it is usually titrated with Phenolphthalein indicator. It can also be titrated with Methyl Violet or Crystal Violet indicator when it is used as a basimetric standard.
KHP is a useful standard for buffering in combination with hydrochloric acid (HCl) or sodium hydroxide (NaOH) depending on which side of pH 4.0 the buffer is to be. It is also a good standard for total organic carbon (TOC) testing. Many TOC analysts suggest testing their instruments with two standards: one that is typically easy for the instrument to oxidize (KHP), and one that is more difficult to oxidize, such as benzoquinone.
To find the true mass of this standard, you weighed out four samples using a new technique-weighing by difference. You placed enough KHP into a small beaker to fill it with samples for your four or five test reactions and weighed the whole thing, before you removed your first sample and reweighed the beaker containing the rest of the KHP. The difference in mass of the first sample and the rest of the KHP is the mass of the KHP itself.
