Would this work as a liquid laundry detergent?

Yes it would work to use it for laundry. You would be way over diluting it that way...they recommend using 2-3 ounces per laundry load, so you would have enough for 1-2 loads, making it a quick way to use up the soap if that is also part of the plan, if you are thinning out your supplies and trying to make do on what you have instead of shopping but you certainly won't save any money. Considering you are talking about 4-5 dollars worth of Dr. Bronner's soap...that is really expensive.

Even if you did use it for laundry, instead of diluting it, I would keep it in the small bottle...saves space in the laundry, it is correctly labelled in case it ever mattered, and you can use it full strength to pre treat stains as you find them.

It is certainly true that Bronner is a versatile product and I use it for everything on camping trips. But not everyday around the house. It is just too expensive compared to even the eco-friendly laundry and cleaning products. However...for bath and body and shampoo, it is an economical product, simply because it is such high quality soap...a teaspoon twice on hair (lather rinse repeat) and then a teaspoon on a washcloth for the body/shave. A tablespoon for a whole shower...8 showers from the amount of product you have left.

Powder or Liquid doesnt really make a change its the components in them that causes damage to the atmosphere. Most laundry detergents on hand will incorporate phosphates and different chemicals that harm the atmosphere. As an alternative that you would be able to buy fully organic liquid and powder detergents which can be thoroughly healthy and constructed from normal products - no phosphates & chemical substances. Higher for your clothes, higher for you and better for the atmosphere.

Give it a try and see how it works. I would wash a load of towels or something like that first.