HCl = H⁺ + Cl⁻
c(HCl)=9.8*10⁻⁵ mol/l
pH=-lg[H⁺]
[H⁺]=c(HCl)
pH=-lg{c(HCl)}
pH=-lg{9.8*10⁻⁵}=4.009
pH=4.009
Pretty sure ur answer would be water and energy
The definition of an exothermic reaction is releasing heat and endothermic reaction is an absorption of heat.
This reaction is exothermic because it releases heat and doesn't absorb it when mixing hydrochloric acid with water.