I was in a store today with a friend who was buying chemicals for his home spa. Curiosity took over and I began to look around and read the labels. On the shelf were two identical looking containers with one stating that is was a Ph + product (increases the ph value of the water) while the other said it was a Ph – product (decreases the ph value of the water). I started thinking that these might be useful in a darkroom especially since the price was ridiculously low for the volume offered.
I turned them over and read the labels. Both products would only claim to have sodium bisulphate in the container.
My question is “How can these products provide both Ph increase as well as Ph decrease from the same chemical (i.e. sodium bisulphate)?
I am sure that the products work as stated it is just that I would appreciate a small Chemistry 101 lesson on this topic.
Kind Regards,
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