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1. Find percentage purity

... 24.59% by mass of NH4+ ion. Calculate the percentage purity of the sample. Assume that the impurity does not contain NH4^+ ion...

分類：科學及數學 > 化學 2010年06月10日

2. 96% purity Alluvial Gold 是甚麼意思　？

96% purity Alluvial Gold 是代表淘出來的金砂 含金純度是 96%, 在南菲...

3. How to determine the purity ?

first, weigth x gram of the sample of hydrated iron(II) sulphate crystals then, dissolve them with L ml water. titrate potassium permanganate solution against the solution then find out amount of potassium permanganate solution used By, 1 x 8H...

分類：科學及數學 > 化學 2006年10月25日

4. 唔識計chem數呀!!!About percentage purity of magnesium oxide

What is back titration ? Back titration is an indirect method of titration. In a back titration, the substance being quantitatively determined is completely reacted with an excess of known amount reagent. The quantity of this unreacted...

分類：科學及數學 > 化學 2007年08月07日

5. 好煩惱! 有關手淫嘅問題!

coz boys' purity is around 14 to 18, ur testicles may not be totally develped, so dont...sperm and semen, otherwise ur jj will get hurt 2010-09-06 20:36:13 補充： puberty not purity , sorry, puberty=青春期, testicles=睪丸

分類：社會科學 > 心理學 2010年09月07日

6. Metals

Because Gold is used as a symbol for purity , value, royalty. see below : Gold has been used as a symbol...

分類：科學及數學 > 化學 2006年10月22日

7. 化學計算題

... in the mixture = 0.12 x (40 + 12 + 16x3) = 0.12 x 100 = 12g Percentage purity = (12/15) x 100% = 80%

分類：科學及數學 > 化學 2007年01月04日

8. Some Qs about optical fibre

1. The material is mostly silica glass with high purity , though fluoride glass or phosphate glass are also used...and pointed out the right material, silica glass with high purity , to manufacture such fibres. There is...

9. 濕粉、乾粉及base問題

1) 如果你本身係比較油d既, 介紹你同philosophy既 purity 洗面, 佢係4合1, 可以落妝, 潔面, 收毛孔同防暗瘡, 洗完...好痴立立! 想控油就用philosophy既hope in a bottle啦, 用佢隻 purity 洗完面之後, 抹乾, 拍收縮水, 用ipsa隻冇油份既保濕茶面...

分類：美容及時尚 > 彩妝 2007年05月23日

10. form.4 chemistry

...of K2CO3 / 138 Mass of K2CO3 = 4.7196g ∴the percentage purity of the carbonate = (4. 7196 / 5.00) X 100% = 94.392%

分類：科學及數學 > 化學 2008年04月22日