Cho etyl fomat lần lượt vào mỗi ống nghiệm chứa riêng biệt Na AgNO3/NH3 ddBr2 ddNaOH. Trong đk thích hợp số phản ứng xảy ra là

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

Newtons second law deals most cosely with

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3