Aspirin(3) was synthesized by esterification reaction of salicylic acid(1) with acetic anhydride(2) catalyzed by aluminum dihydrogen tripolyphosphate/loaded sulfur diatomite. The effects of materials ratio[r = n(2) ∶ n(1) ],reaction time,temperature and catalyst amount on the yield of 3were investigated by the single-factor experiments. The results showed that the four main factors influencing the yield of 3 are in the following order: r reaction time reaction temperature catalyst amount. Under the optimum reaction conditions[1 was 50 mmol,the catalyst amount was 5%,r was3. 14,at 81 ℃ for 40 min],the yield was 88. 6%. The yield still reach 83. 3% after reuse for five times of the catalyst
Answer:
Chromatography is the separation of a mixture by passing it in solution or suspension or as a vapor. It's mainly used for separation and analytical study of organic and inorganic mixtures.
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Answer:
9.86*10^(-3) g
Explanation:
PbSO4 ----> Pb^(2+) + SO4^(2-)
s s
Ksp = s²
s =√Ksp = √(1.8*10^-8) = 1.3*10^(-4) mol/L
The molar solubility PbSO4 = 1.3*10^(-4) mol/L.
2.50 *10^2 mL *1L/10³mL =0.250L
1.3*10^(-4)mol/L *0.250L*303.3 g/mol = 9.86*10^(-3) g
Answer:
C₄H₉O₂
Explanation:
just count the amount of atoms present in the model.
<h2>
Answer: magnesium sulfide</h2>
<h3>
Explanation:</h3>
MgS → Mg²⁺ + S²⁻
S²⁻ is known as the sulfide ion. That makes MgS Magnesium Sulfide.
For consideration:
magnesium sulfide MgS
magnesium sulfite MgSO₃
magnesium sulfate MgSO₄
magnesium sulfur Mg & S
