Final answer:
Calibrating a refractometer with tap water is false; it should be calibrated with distilled water or a known calibration solution. The Law of Refraction describes light bending towards the normal as it enters water from air. A burette is used for measuring volumes in titrations.
Step-by-step explanation:
The statement that calibrating a refractometer with tap water is perfectly acceptable is false. When calibrating laboratory instruments, such as a refractometer, it is important to use a substance with a known refractive index, such as distilled water or a calibration solution specifically designed for refractometers. Tap water may contain impurities and minerals that could affect the refractive index and result in inaccurate calibration.Moreover, in the context of light refraction, The Law of Refraction indicates that when light travels from air into water, the light will bend towards the normal because water is denser than air, causing the light to slow down and change direction.In addition, when doing titrations in chemistry, it is critical to accurately measure volumes. A burette is the precision instrument traditionally used for this purpose to ensure precise delivery of titrant.