Photosyntheis... 急問!!!

2008-05-19 1:54 am
What's the different and use of sodium hydrogencardonate, sodium hydroxide solution and soda lime? ( for experiment about photosynthesis of green plants)
(please ans. in Chinese^^)

回答 (2)

2008-05-23 10:23 pm
NaHCO3:
HCO3- H (from dissolved CO2) ---> H20 CO2
=====> 放CO2
所以NaHCO3 多數用來提供excess CO2, 咁CO2就唔係limiting factor, photosynthetic rate 就由其他factors決定(e.g. 溫度)

NaOH & soda lime:
2NaOH CO2 ---> Na2CO3 H2O
=====> 吸CO2
用以決定change of volume of O2

2008-05-23 14:26:07 補充:
出唔到d加號...
希望你睇得明...
2008-05-19 2:28 am
sodium hydrogencarbonate:釋放二氧化碳
(2NaHCO3 --> Na2CO3 + CO2 + H2O)
sodium hydroxide solution及soda lime:吸收二氧化碳
(soda lime係一種混合物,有氫氧化鈉(sodium hydroxide)、氫氧化鉀(potassium hydroxide)、熟石灰(calcium hydroxide),三樣野都吸到二氧化碳)
(2[OH]- + CO2 --> [CO3]2- + H2O) (for 氫氧化鈉 and 氫氧化鉀)
(Ca(OH)2 + CO2 --> CaCO3 + H2O) (for 熟石灰)


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