<P> Potassium hydrogen phthalate , often 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 . KHP is slightly acidic , and it is often used as a primary standard for acid - base titrations because it is solid and air - stable , making it easy to weigh accurately . It is not hygroscopic . It is also used as a primary standard for calibrating pH meters because , besides the properties just mentioned , its pH in solution is very stable . It also serves as a thermal standard in thermogravimetric analysis . </P>
<P> Potassium hydrogen phthalate , often 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 . KHP is slightly acidic , and it is often used as a primary standard for acid - base titrations because it is solid and air - stable , making it easy to weigh accurately . It is not hygroscopic . It is also used as a primary standard for calibrating pH meters because , besides the properties just mentioned , its pH in solution is very stable . It also serves as a thermal standard in thermogravimetric analysis . </P>
characteristics of khp that make it qualify as a primary standard
characteristics of khp that make it qualify as a primary standard
because it is solid and air - stable , making it easy to weigh accurately
because it is solid and air - stable , making it easy to weigh accurately