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  1. ... sulfate is used during the procedure of the soil pH test. Soil pH is an indication... are not taken to maintain a balance. Soil pH is an important consideration for farmers...

    分類:科學及數學 > 化學 2006年11月03日

  2. ... salt + alkali → salt + ammonia + water 這化學反應便可以應用於 neutralize alkaline soil . 例如: (NH4)2 SO4 (aq) + 2NaOH (aq) → Na2SO4 (aq...

    分類:科學及數學 > 化學 2007年05月09日

  3. Soil are usually acidic. If the soil is too acidic, it will not be suitable... adding slaked lime, it can increase the pH value of soil i.e. make the soil become less acidic. Then the plants can grow ...

    分類:科學及數學 > 化學 2010年04月26日

  4. After planting for a period of time, the soil becomes acidic. The farmer adds lime (calcium oxide) to the soil ...

    分類:科學及數學 > 化學 2014年08月21日

  5. 1. metals are extracted in the soil and used. however, after using (eg, old iron window... are accumulated in the soil and can hardly be removed, which are harmful in...

    分類:科學及數學 > 化學 2006年12月07日

  6. ... on forests, freshwaters and soils , killing off insect and aquatic lifeforms as...to acid rain, like the acid's effects on soil or high concentration of gaseous precursors to acid rain...

    分類:科學及數學 > 化學 2008年01月18日

  7. I have to regret that I only know the answer for question 3. (3): Soil is usually acidic, as normal rain has a pH of 5.6, and rain with...

    分類:科學及數學 > 化學 2015年04月15日

  8. ...aq) + 2e- → H2(g) Farmer would not use sodium hydroxide to reduce soil acidity, because (1) sodium hydroxide is very corrosive. (2) farmer can obtain calcium oxide...

    分類:科學及數學 > 化學 2009年06月26日

  9. ...reaction is not count as neutralization reaction. "neutralize acidity of soil " = increase pH value

    分類:科學及數學 > 化學 2010年01月10日

  10. In soil testing kit, the detection methods are based on colormetric...

    分類:科學及數學 > 化學 2007年12月05日