Just fyi, you need at least 4X the volume of butane to dissolve a mass of pure THCa. You have little to no terpenes acting as cosolvents and usually the butane must be cold to stay liquid in a jar. You need a lot of headspace to do it safely, too. Use a big quart size jar for 50g of the powder… and use around 200 to 300mL of butane for 50g powder, especially cold.
You really should just buy a liter of n-hexane. Make it easy on yourself.