Здійснити перетвореня: HBr---->NaBr--->Br2--->HBr---->AgBr
2HBr+2Na=2NaBr+H2 2NaBr+Cl2=2NaCl+Br2 H2+Br2=2HBr 2HBr+Ag2O=2AgBr+H2O