The pH of the water is not a measure of the strength of the acidic or basic solution and alone does not provide a full picture of the characteristics or limitations with the water supply. In general, a water with a low pH (< 6.5) could be acidic, soft, and corrosive.
Price of a Stamp. The current price of a first class stamp is 49 cents. A domestic first class letter (1 oz.) is 49 cents. The price of each additional ounce is 21 cents. It will cost you 34 cents to send a domestic postcard.
The price of a stamp for a First Class Mail Letter (1 oz.) today is $0.49 which makes a book of 10 stamps cost $4.90, a book of 20 $9.80, and a coil of 100 $49.