en_tn/pro/25/20.md

carbonate of soda

This is a kind of mineral that hisses and bubbles violently when it comes into contact with acids like vinegar. Many translations translate this phrase as "a wound."

sings songs

You may need to make explicit what kind of songs the singer sings. AT: "sings happy songs" (See: rc://en/ta/man/translate/figs-explicit)

a heavy heart

The heart is a synecdoche for the whole person. AT: "a sad person" (See: rc://en/ta/man/translate/figs-synecdoche)