“Titration is a common lab method in chemical analysis. It is the slow addition of one solution of a known concentration (called a titrant) to a
known volume of another solution of unknown concentration until the
reaction reaches neutralization, which is often indicated by a color
change." No heat source is involved. Given the information above, which
safety precaution should be observed when titrating NaOH into a beaker?
NaOH is a solution that is caustic (able to burn or corrode organic tissue).
Skin contact should be avoided.
A. Wear protective eyewear.
B. Wear heat-protective gloves.
C. Avoid open flames
D. Only work in lab groups of 3 or 4.

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straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.

i think the answer is a.keratin is the pigment responsible for skin color.