One half of a 1/2-ounce liquid is (1/2)*(1/2)=1/4 ounces.
1/4 ounce of Dawn liquid soap can make (1/4)*200,000=<<(1/4)*200000=50000>>50,000 bubbles.
1/4 ounce of Dr. Bronner's liquid soap can make 2*(1/4)*200,000=100,000 bubbles.
Therefore, a half ounce of an equal mixture of Dawn and Dr. Bronner's liquid soaps can make 50,000+100,000=<<50000+100000=150000>>150,000 bubbles.
#### 150,000