6-14-2018 1159 PM 60-2-100 Gradeboo -Print Calculator Periodic Table Q.docx

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6/14/2018 1159 PM 60.2/100 Gradeboo -Print Calculator Periodic Table Question 45 of 55 Sapling Learning Map At 25 ?, how many dissociated OH ions are there in 1 267 mL of an aqueous solution whose pH is 2.08? Number ions O Previous Give Up & View Solution Check Answer Next x to search ? Solution use: pH = -log [H+] 2.08 = -log [H+] [H+] = 8.318*10^-3 M use: [OH-] = Kw/[H+] Kw is dissociation constant of water whose value is 1.0*10^-14 at 25 oC [OH-] = (1.0*10^-14)/[H+] [OH-] = (1.0*10^-14)/(8.318*10^-3) [OH-] = 1.202*10^-12 M number of mol of OH- = [OH-] * volume in L = 1.202*10^-12 M * 1.267 L = 1.523*10^-12 mol number of OH- = number of mol * Avogadroâ€™s number = 1.523*10^-12 mol * 6.022*10^23 ions/mol = 9.17*10^11 ions Answer: 9.17*10^11 ions .

6/14/2018 1159 PM 60.2/100 Gradeboo -Print Calculator Periodic Table Question 45 of 55
Sapling Learning Map At 25 ?, how many dissociated OH ions are there in 1 267 mL of an
aqueous solution whose pH is 2.08? Number ions O Previous Give Up & View Solution Check
Answer Next x to search ?
Solution
use:
pH = -log [H+]
2.08 = -log [H+]
[H+] = 8.318*10^-3 M
use:
[OH-] = Kw/[H+]
Kw is dissociation constant of water whose value is 1.0*10^-14 at 25 oC
[OH-] = (1.0*10^-14)/[H+]
[OH-] = (1.0*10^-14)/(8.318*10^-3)
[OH-] = 1.202*10^-12 M
number of mol of OH- = [OH-] * volume in L
= 1.202*10^-12 M * 1.267 L
= 1.523*10^-12 mol
number of OH- = number of mol * Avogadroâ€™s number
= 1.523*10^-12 mol * 6.022*10^23 ions/mol

= 9.17*10^11 ions
Answer: 9.17*10^11 ions

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2. = 9.17*10^11 ions Answer: 9.17*10^11 ions