Miscellaneous mistakes
dropper, pipette, or dropping pipette precautions to ensure accuracy and prevent contamination. Always hold the dropper vertically and steadily, with the tip suspended just above the container to avoid touching the sides or bottom, which could introduce impurities. — minimize the risk of external contamination. After each use, properly clean the dropper, ensuring thorough rinsing to avoid cross-contamination between different liquids. For droppers intended for specific uses, such as those provided with dropper bottles, avoid using them for other purposes to maintain their integrity and dedicated function. ['pɪpɛt]
pipette ['pɪpɛt] To ensure accurate and contamination-free liquid transfer. Always ensure that the pipette is clean and dry before use, as any residual moisture or contaminants could affect the accuracy of your measurements. When aspirating liquid, hold the pipette vertically and immerse only the tip into the liquid, avoiding contact with the sides of the container to prevent contamination. Gently aspirate the liquid by applying suction, and be careful not to overfill the pipette to avoid spillage. Dispense the liquid slowly and carefully into the receiving container, ensuring that the tip of the pipette does not touch the sides or bottom of the container. Pipettes are designed for specific volumes and should not be used interchangeably. Always use the pipette that corresponds to the volume you need to measure. After use, clean the pipette thoroughly, ensuring complete rinsing to prevent cross-contamination. rubber suction bulb
Qualitative experiment Purpose: identify, classify, and describe the properties, characteristics, or components of a substance or system without measuring their quantities. Methods: observations, color changes, precipitation reactions, and other indicators that provide information about the presence or absence of certain substances. Outcome: Results are typically expressed in descriptive terms, such as positive/negative reactions, color changes, or other qualitative indicators. Quantitative experiment Purpose: test hypotheses, establish causal relationships, or make predictions based on numerical data. (to measure and analyze) Methods: collect numerical data using scales, indices, or other quantifiable metrics. Outcome: are numerical and often presented in the form of statistical summaries, graphs, or tables