With an electronegativity of 0.89, Barium requires the least amount of energy to remove its valence electrons.
H is the answer which represent a pair of isotopes
Answer:
28.9
Explanation:
4.5+24.4
= 28.9
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Saccharin is considered as weak acid:
pH of weak acid =
pKa = 2.32 (given) and
pCa = -log (acid concentration) = - log (0.11) = 0.96
so pH =
Answer:
To make the buffer you must add 1 mole of MES in the liter of the buffer.
Explanation:
To find pH of the buffer of MES you must use Henderson-Hasselbalch equation:
pH = pKa + log [MES⁻] / [MES]
<em>Where [MES⁻] is molar concentration of unprotoned MES and [MES] molar concentration of the acid</em>
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Replacing:
6.2 = 6.2 + log [1M] / [MES]
<em>Molar concentration of [MES⁻] is 1mol / L = 1M</em>
0 = log [1M] / [MES]
1 = [1M] / [MES]
[MES] = 1M
That means to make the buffer you must add 1 mole of MES in the liter of the buffer
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