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Suppose a sodium hydroxide solution were to be standardized against pure solid primary standard...

Question:

Suppose a sodium hydroxide solution were to be standardized against pure solid primary standard grade KHP. If 0.4538 g of KHP requires 44.12 mL of the sodium hydroxide to reach a phenolphthalein endpoint, what is the molarity of the NaOH solution?

Standardization:

Standardization is used to determine the exact molarity a solution. The reason that a standardization must be completed for some solutions is related to the properties of the solution. For example, sodium hydroxide is hygroscopic, which means that it absorbs water from the air. Therefore, any attempts to weigh NaOH are inaccurate. An inaccurate mass will lead to an incorrect calculation of the molarity. Therefore, a solution of NaOH is made and titrated against a pure compound to determine the exact molarity.

Answer and Explanation:

The first step to solve this problem is to convert grams of C8 H5 NaO4 (KHP) to moles using the molar mass. The molar mass of KHP is 204.22 g/mol.

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Calculating Molarity and Molality Concentration

from Chemistry 101: General Chemistry

Chapter 8 / Lesson 4
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