Hydroxyl ion concentration of 1M HCl is?
Jayant Kumar , 11 Years ago
Grade 11
Engineering Entrance Exams> Hydroxyl ion concentration of 1M HCl is?...
2 Answers
Saurabh Koranglekar
Last Activity: 5 Years ago
Vikas TU
Last Activity: 5 Years ago
As molarity of HCl is given 0.1 this means concentration i.e. no. of moles per volume is 0.1 for HCl and same will be for [H+]. As each molecule of HCl gives out 1 H+ ion on ionisation.
now let us come to the PH part
PH=log[H+]
=log(0.1). so PH = 1 (very acidic as per ph scale at 298K)
now we know at 298K P[H+] + P[OH-] = 14 ( as Kw = 10 raised to the power -14)
so P[OH-] = 13
so -log[OH-] = 13
and then the answer [OH-] = 10 raised to power of -13(negative 13)
concentration of OH- ion is so less that it can easily be neglected as compaired to H+ ion’s concentration.
Thank you
Hope you are satisfied by the answer.
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