coursework - unknown acid: tests - PLEASE HELP!!!!! can someone PLEASE help me?!?!?! as my username suggests...i am thick when it comes to Chemistry....so i really need some help with my coursework. basically i need to know the 2 chemical tests (without use of indicators) to test an unknown aqueous substance to see if it is an acid. 1 test is CO2 emission in Limewater. 2 test is H emission from acid + metal. thing is...i dont know how you actually DO these tests....or anything about the H+ ions which cause the gas emissions. PLEASE PLEASE PLEASE can someone help me out?????? i need to know about the donating and receiving of H+ ions AND the apparatus needed and the methods of both the 2 tests. Sorry...should have said...the unknown acid formula is MHSO4 (where M is either sodium or potassium).