A strong base solution with a known concentration, usually NaOH or KOH, is added to neutralize the acid solution according to the color change of the indicator with the amount of base added.
ɐ stɹˈɔŋ bˈeɪs səlˈuːʃən wɪð ɐ nˈoʊn kˌɑːnsəntɹˈeɪʃən, jˈuːʒuːəli nˈɑː ˌoʊˈeɪtʃ ɔːɹ kˌeɪˌoʊˈeɪtʃ, ɪz ˈædᵻd tə nˈuːtɹəlˌaɪz ðɪ ˈæsɪd səlˈuːʃən ɐkˈoːɹdɪŋ tə ðə kˈʌlɚ tʃˈeɪndʒ ʌvðɪ ˈɪndᵻkˌeɪɾɚ wɪððɪ ɐmˈaʊnt ʌv bˈeɪs ˈædᵻd.