ce chem molarity

炎夏

真廢,竟然唔識

1. 1.26g of a hydrated dibasic organic acid of anhydrous molecular msaa 90 were made up to 25.0cm3 with water. 25.0cm3 of this solution required 20.0cm3 of 0.100M potassium hydroxide solution for neutralization. Calculate the number of molecules of wateror crystallization per molecule of the hydrated acid.

2. 3.60g of a solid mixture of sodium carbonate-10-water(Na2Co3 . 10H2O)and sodium hydrogen carbonate(NaHCO3)required 23.0cm3 of 1.50M hydrochloric acid for complete reaction.
Calculate the percentage by mass of each substance in the mixture.

3. 100cm3 of a solutionB containing nitric acid and hydrochloric acid required 68.0 cm3 of 1.00M sodium hydroxide solution for exact neutralization.50.0 cm3 of B reacted with excess silver nitrate solution to give 2.725g of silver chloride. Find the concentration(in g dm-3) of each acid in B.

2076

一年前我識做

炎夏

原帖由 2076 於 2006-4-30  09:02 PM 發表
一年前我識做

回來吧

Cassano

有冇atomic mass

Raul

原帖由 Cassano 於 2006-4-30  22:45 發表
有冇atomic mass

你都有chem書啦

炎夏

原帖由 Cassano 於 2006-4-30  10:45 PM 發表
有冇atomic mass

K=39.0
Na=23.0
H=1.0
O=16.0
C=12.0
Cl=35.5
S=32.0
N=14.0
Ag=107.9

2076

原帖由 炎夏 於 2006-4-30  10:20 PM 發表

回來吧

已經廢晒武功
依家叫我去考C都不保

Cassano

有人o係golden問左3條一樣o既問題

溫陣physics 先試下呢幾條~ chem考完成4日咁多唔知仲記唔記得

炎夏

原帖由 Cassano 於 2006-4-30  11:02 PM 發表
有人o係golden問左3條一樣o既問題

溫陣physics 先試下呢幾條~ chem考完成4日咁多唔知仲記唔記得

<-

冇人應

炎夏

原帖由 炎夏 於 2006-4-30  11:02 PM 發表

<-

冇人應

http://forum2.hkgolden.com/view.asp?message=627866

受番,有好心人

Cassano

原帖由 炎夏 於 2006-4-30  11:06 PM 發表

http://forum2.hkgolden.com/view.asp?message=627866

受番,有好心人

O.....好彩我淨係做左一題jei

Raul

仲唔快d去多謝人

炎夏

原帖由 Raul 於 2006-4-30  11:20 PM 發表
仲唔快d去多謝人

DONE

FORUM 1 is too slow

2076

原帖由 Cassano 於 2006-4-30  11:18 PM 發表


O.....好彩我淨係做左一題jei

hi
AL Chem有咩心得? 我唔識讀

Cassano

原帖由 2076 於 2006-4-30  11:42 PM 發表


hi
AL Chem有咩心得? 我唔識讀

我拎E 架wor諗住