What is the classification for: CH 3 CH 2 CH 2 CH 2 COORb from the following lis

Question

What is the classification for: CH3CH2 CH2CH2COORb from the following list?

(quite often you will have more than one classification possible for one compound)

Strong Acid (SA)                          Weak acid (WA)                     Soluble salt (SS)                         

Strong Base (SB)              Weak Base (WB)                    Slightly soluble salt (IS)

Diprotic Acid (DA)                      Diprotic base (DB)     

Triprotic acid (TA)                       Triprotic base (TP)'

My rationale:

CH3CH2 CH2CH2COORb <--> CH3CH2COO- + Rb+

CH3CH2COO- is a conjugate of a weak acid CH3CH2COOH

Rb+ is a neutral ion

so is the answer that it is strongly basic and insoluble?

Explanation / Answer

CH3CH2CH2CH2COORb --> Rb+ + CH3CH2CH2CH2COO-

then

CH3CH2CH2CH2COO- + H2O ---> CH3CH2CH2CH2COOH + OH-

this must be slightly basic

choose

Weak Base (WB); since it will free OH- ions in solution partially

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