If

V_dish = 0.75 mL
[CNQX]_stock = 300 uM

then   	

	V_dish(mL)	V_add(uL)	[CNQX] (uM)		
	0.7500  	0         	0
    	0.7525  	2.5084    	1.0000
    	0.7627  	10.2035    	5.0000
    	0.7759  	13.1502   	10.0000
    	0.8036  	27.7094   	20.0000
    	0.8654  	61.8132   	40.0000
    	1.0227  	157.3427   	80.0000