Kamir and Alexis are studying the properties of water. They conducted a variety of experiments to determine its physical and chemical properties
They conducted a variety of experiments to determine its physical and chemical properties.
Answer:
Use Ka3
henderson-hasselbach equation: pH = pKa + log [base]/[acid]
pKa3 = - log Ka3 = - log 4.2 x 10^-13 = 12.38
therefore: pH = 12.38 + log (0.28/0.33) = 12.30
the pH is 12.30
Explanation:
phosphoric acid is a polyprotic acid meaning it donates more than one proton
weak Acid ↔ conjugate Base
H3PO4 ↔ H2PO4^- corresponding to Ka1
H2PO4^- ↔ HPO4^2- corresponding to Ka2
HPO4^2- ↔ PO4^3- corresponding to Ka3
A buffer consist of a weak acid and its conjugate base, the given buffer has the combination of HPO4^2- and PO4^3- thud we used Ka3
knowing that we used henderson-hasselbach equation to get the pH which is 12.30
When electrons in atom interaction with light or photons one of the two process takes place:
1) they can absorb photons of a characteristic wavelength (which depends on the energy difference between two interacting atomic levels) and get excited to a higher energy level
2) or they can jump to a lower energy level and emit photons of the corresponding wavelength.
The type of spectrum produced when electrons in an atom undergo transitions to various levels by absorbing or emitting photons is termed as atomic spectrum.
Answer:
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
Explanation:
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