first calculate the molarity of the solution
molarity = (W /MW) (1000 / V inmL)
molarity = (0.135 / 36.46) (1000 / 650)
molarity = 0.0057 M
as HCl is strong acid so it dissociates completely
[HCl] = [H+] = 0.0057 M
pH = - log [H+]
pH = - log [0.0057]
pH = 2.24
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