What is the ph of a solution of h2so4 that has [h3o+] = 5.45 × 10–5 m?

In chemistry, pH is a numeric scale used to specify the acidity or basicity of an aqueous solution. It is approximately the negative of the base 10 logarithm of the concentration of hydronium ions. We calculate as follows:

pH = -log [H3O+]
pH = -log[5.45 × 10–5 M]
pH = 4.3

Do u have the n? or maybe the m?