Zat berikut yang termasuk larutan baku primer adalah …Select one:a. Asam Benzoatb. Kalium Biftalatc. Natrium Kloridad. Natrium Hidroksidae. Natrium Tetraborat

Break Down the Problem

1. Identify the properties of a primary standard solution.
2. Review the options provided to determine which of them qualifies as a primary standard.

Relevant Concepts

• A primary standard must be pure, stable, non-hygroscopic, and have a known and high molar mass, allowing it to be accurately weighed.

Analysis and Detail

1. Asam Benzoat (Benzoic Acid): Can be used but often not pure enough and not handled very easily.
2. Kalium Biftalat (Potassium Biphthalate): Pure and stable; commonly used as a primary standard for acid-base titrations.
3. Natrium Klorida (Sodium Chloride): Stable and pure, but not typically used due to its soluble nature in water causing variation in concentration.
4. Natrium Hidroksida (Sodium Hydroxide): Hygroscopic and unstable, not suitable as a primary standard.
5. Natrium Tetraborat (Sodium Tetraborate): Works but has moisture sensitivity which complicates its use as a primary standard.

Verify and Summarize

Upon analysis, the most suitable choice based on the criteria for a primary standard is Kalium Biftalat (Potassium Biphthalate).

Final Answer

b. Kalium Biftalat