The purpose of using distilled water in the cuvette of the spectrophotometer is to calibrate the instrument. It is generally considered that distilled water shows zero absorbance and 100 % transmittance. So, to zero out the absorbance of compounds other than the analyte being determined, distilled water is used as a blank.
If the unknown being determined is prepared using ethanol as the base solution, the blank used must be ethanol. This is because absorbance if any from the solvent, ethanol must be zeroed out as when the measurement of the actual unknown is being made, the absorbance of the solvent does not interfere.
Some examples are like Russia, Egypt, China, Brazil
Answer: The mass of the nucleus is less than the mass of the 8 protons and 8 neutrons.
Explanation:
Answer:
They neutralize each other
Answer:
B
Explanation:
Atomic # = Protons
it says 4 p in the inside of the orbital
