Evolution of gas during chemical reaction Why is it that whenever hydrogen gas is produced in a reaction, it comes out in the form of tiny bubbles, but whenever Carbon dioxide is produced it comes out in the form of a brisk effervescence like lather?
Likely, any difference you've observed is due to the high solubility of $\ce{CO2}$ in water... it allows accumulation of enough dissolved gas to nucleate and form large bubbles, as in seltzer. BTW, $\ce{Na}$ or $\ce{K}$ etc. do not make tiny bubbles when put in water.