作者theodore ( 一直在找一個人)
看板Chemistry
標題請教一題分析化學考古題!!
時間Sat Jul 8 00:50:14 2006
for a titration suppose that the standard deviation
in reading the buret is 0.02ml for the initial
and 0.02ml for the final reading
and that the standard deviation in location the end point is 0.04ml.
from this information
calculate the overall standard deviation for the titration
a)0.024
b)0.0024
c)0.049
d)0.08
e)0.28
答案是e
可是我不知道為什麼 有沒有高手可以解釋一下!!
謝謝
--
尋尋覓覓 只能找到你的影子
雖然時間已經快跑六年
但是
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.223.214.96
1F:→ theodore:可以推文或丟水球給我!! 07/08 00:51
2F:推 nestealee:0.02^2+0.02^2+0.04^2=0.0024,0.0024開方得答案 07/08 21:27
3F:推 theodore:可是解答的答案給E耶!! 07/09 18:23
4F:推 nestealee:答案只有ACD可選...題幹有效位數都是到小數點第二位 07/10 14:19