What is this that has formed in the bucket?

[Dom]

So I reconditioned 2 lead acid batteries that are the backup to my tanks. The old acid is in a 5 gallon bucket, and I have been adding baking soda to neutralize the acid.

Over the last week, I've added 2 pounds of baking soda to the acid. Last night, I added a 3rd pound and found this in the morning: It looks like slushy water.

What exactly happened here? Does this mean the acid is neutral and safe to dispose of?

@Randy Holmes-Farley

 

[Randy Holmes-Farley]

You likely hit the solubility limit of sodium sulfate or excess sodium bicarbonate if you added excess. More water will dissolve it.

 

[Dom]

You likely hit the solubility limit of sodium sulfate or excess sodium bicarbonate if you added excess. More water will dissolve it.

Thank you.