The answer is GRAINS
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Solution a is more basic.
Basic solutions are those solutions whose pH is greater than 7.
The pH of a solution is calculated or determined by the hydrogen ion concentration of the solution. The relation between pH of a solution and the hydrogen ion concentration in it is given by :
pH = -log[ H+]
From this relation we can conclude that if the hydrogen ions concentration in a solution is more , the value of pH will become lower.
For Solution a, the pH is given by :
pH(a) = -log [ 3.2 x 10^-9 ] = 8.4948 ≅ 8.5
For Solution b, the pH is given by :
pH(b) = -log [ 9 x 10^-5 ] = 4.04 ≅ 4
Since the pH of solution b is lower than the pH of solution a , solution a is more basic than solution b. Moreover, the pH of solution a is approximately 8.5 which makes it a moderately strong basic solution.
(To know more about pH : brainly.com/question/1542454 )
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