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Use a primary standard to determine an unknown concentration using an acid–base titration. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP. If 28.41 mL of a sodium hydroxide solution are needed to neutralize 3.323 grams of KHP, what is the concentration (mol/L) of the sodium hydroxide solution?

Sulfamic acid is a primary standard that can be used to standardize NaOH. What is the molarity of a sodium hydroxide solution if 34.26 mL react with 0.3337 g of sulfamic acid?

Why are AgNo3 and KSCN not primary standard substance?