Question
Asked Oct 24, 2019

Write th complete, ionic and net-ionic equation for the reaction below.

Add a dropperful of 0.1 M NaOH and one drop of phenolphthalein to a test tube. Note the color. Add 0.1 M HCl drop by drop until the color changes. 

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Expert Answer

Step 1

Phenolphthalein HPh splits into its ions H+ and Ph-, while NaOH splits into Na+ and OH-By mixing HPh and NaOH, the net ionic equation will be:

Naag) *Phaq) *#2°0)
+Phaq)H2
+OF (aq)
'(aq)
H P(ag)Na
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Naag) *Phaq) *#2°0) +Phaq)H2 +OF (aq) '(aq) H P(ag)Na

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Step 2

The net ionic equation will be:

"(ag) "ОН:
(aq)
ноФ
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"(ag) "ОН: (aq) ноФ

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Step 3

Using LeChatelier’s Principle, adding NaOH turns the solution pink, it shifts the equilibrium of phenolphthalein HPh to the right towards the products H+ and Ph- whic...

н+Phjao +Cс(ag)
(aq)
Наag "Ph (ag *Cfag Нag "Ph ag) *CYag
'(aq)
(aq)
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н+Phjao +Cс(ag) (aq) Наag "Ph (ag *Cfag Нag "Ph ag) *CYag '(aq) (aq)

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