Returns the logarithm (base 10) of a.
If a is ##NaN or negative => ##NaN
If a is ##Inf => ##Inf
If a is zero => ##-Inf
See: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#log10-double-
;; Let's calculate the pH when 1g of hydrochloric acid is added to 2L of water…(let[HCl-grams1H2O-litres2HCl-molar-mass36.46HCl-moles(/HCl-gramsHCl-molar-mass);; HCl is a strong acid, so dissociates completely in watermolarity(/HCl-molesH2O-litres)];; pH is calculated as pH = -log₁₀([H⁺])(-(math/log10molarity)));; => 1.8628466599829387