1條log Question (急)

希望我幫到你啦
數學書的答案基本上是沒有大問題的﹐雖然不是很正確。
這條要識少少化學知識
A neutral pH measurement equals 7
substitute into the formula
pH = - log[H+]
7= - log[H+]
log[H+]=-7
H+=10^(-7) mol/L
We know that one mole contains Avogadro's number (approximately 6.022×1023) entities.
So the number of molecules of H+ is
10-7*6.022×1023
=6.022×1016

Notice that the order of magnitude is 1016
所以粗略來說數學書的答案是對的。

your answer is wrong, you should check

在標準溫度和壓力下，pH=7的水溶液（如：純水）為中性，這是因為水在標準溫度和壓力下自然電離出的氫離子和氫氧根離子濃度的乘積（水的離子積常數）始終是1×10-14，且兩種離子的濃度都是1×10-7mol/L