ðə sʌlfjˈʊɹɹɪk ˈæsɪd ˌɪntɚmˈiːdiət fˈɔːɹmd ˈæftɚ ɹɪˈækʃən ʌv sˈʌlfɜː wɪð fjˈuːmɪŋ nˈaɪtɹɪk ˈæsɪd fˈɔːɹmz ɪnsˈɑːljuːbəl bˈɛɹiəm sˈʌlfeɪt ˌɔn ɐdˈɪʃən ʌv bˈɛɹiəm klˈoːɹaɪd.
The sulfuric acid intermediate formed after reaction of sulfur with fuming nitric acid forms insoluble barium sulfate on addition of barium chloride.