hcl + naoh ⇒ nacl + h2o We will use BTB, which is a chemical pH indicator that will changes color depending on pH changes to show us when the solution has been fully neutralized. * Acid is a compound with regard to this question which loses its H+ ion and form a conjugate base. HCl (aq) + 1 NaOH (aq) → H2O (ℓ) + NaCl (aq) Back to reactions list . * Base is a compound … Is the reaction between HCl and NaOH endothermic or exothermic? Upon hitting submit, the stoichiometric equivalents will be … * It is a acid base reaction, therefore neutralization will take place. Stoichiometry. It is good to consider that BTB on its own is a bit acidic which is why when it is added to HCL… The reaction of HCl(aq), a strong acid, with NaOH… Enter a mass or volume in one of the boxes below. The person in the video most likely added excess NaOH, which not only neutralised the HCL, but also caused the pH to increase (higher NaOH concentration = higher pH) and so, lead to the dark purple. This reaction is classified as an exothermic reaction. Calculating the limiting reactant, the change in enthalpy of the reaction, … For example, suppose you add 25 mL of 1.0 M NaOH to your HCl to produce a heat of neutralization of 447.78 Joules. HCl(aq) + NaOH(aq) --> NaCl(aq) + H 2 O(l) + Energy. Thermochemistry determine the heat exchanged at constant pressure, q = m c ∆T..