"Yes. Generally, chemical names ending with -ate have three (or more) oxygen atoms in it. Examples: \n* sulfate - SO42- \n* carbonate - CO32- \n* nitrate - NO3- The other suffixes are -ite (less oxygen atoms) and -ide (no oxygen atoms (?)). \n* sulfite - SO32- \n* nitrite - NO2- Potassium sulfate / sulphate - K2SO4"@en . . . "Is there oxygen in potassium sulphate"@en . "Yes. Generally, chemical names ending with -ate have three (or more) oxygen atoms in it. Examples: \n* sulfate - SO42- \n* carbonate - CO32- \n* nitrate - NO3- The other suffixes are -ite (less oxygen atoms) and -ide (no oxygen atoms (?)). \n* sulfite - SO32- \n* nitrite - NO2- Potassium sulfate / sulphate - K2SO4"@en . . .