6D 13

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Jessica Kwek 4F
Posts: 29
Joined: Mon Jan 06, 2020 7:57 am

6D 13

Postby Jessica Kwek 4F » Wed Jan 22, 2020 3:36 pm

Question: Rank the following solutions in order of increasing pH: (a) 1.0 3 1025 m HCl(aq); (b) 0.20 m CH3NH3Cl(aq); (c) 0.20 m CH3COOH(aq); (d) 0.20 m C6H5NH2(aq). Justify your ranking.

How do we calculate the pH of the weak acid/bases using an ice table? I am confused on part b since CH3NH3Cl is a conjugate acid so I'm not how to set up the equation to find the value of x.

Hui Qiao Wu 1I
Posts: 56
Joined: Fri Aug 30, 2019 12:16 am

Re: 6D 13

Postby Hui Qiao Wu 1I » Wed Jan 22, 2020 3:47 pm

I believe you will have to use the table they gave to you for the value of k. Then set up the ice table with your reaction. Since these compounds are aqueous, they are reacting with water. After you have found the [OH-] or[H+], take the -log of the concentration to get pH or pOH. After you have found pOH, you can subtract it from 14 to get pH. Then you can rank them.

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