Why is a buffer only effective within a certain pH range? A. A buffer is only effective when the ratio of weak acid to conjugate base is 1.
B. A buffer cannot be effective in an acidic and basic pH range.
C. Buffers are destroyed outside of this range.
D. As the buffer resists pH changes its acid or base gets used up.
E. Buffers are made so that they are effective for a certain pH because chemists rarely encounter situations where a broader-range buffer is necessary.

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8