The sensitivity of a spectrophotometer allows detection of 1 percent of one colored form of an indicator (for example HIn) in the presence of 99 percent of the other colored form (In- ). Based on this fact, over what pH range relative to its pK can an indicator be used if a spectrophotometer is employed

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answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

gold is my favorite solid.