I need help balancing this problem

HClO3(aq excess) + CaCO3
I got to
HCO3 + CaCiO3

2 answers

HClO3 + CaCO3 ==> H2O + CO2 + Ca(ClO3)2
I think you can balance it with the right products.
What does it mean by aq excess and is this something I need to pay attention to. Does it help me balance the equation