接触法制硫酸时，为什么三氧化硫要用浓硫酸吸收而不是直接用水吸收？
Why is SO3 absorbed in concentrated sulfuric acid rather than water in the contact process?
若直接用水吸收SO3，会剧烈放热并产生大量酸雾，难以完全吸收。用约98%的硫酸吸收可避免酸雾、吸收更彻底，再稀释得到产品酸。
Absorbing SO3 in water releases huge heat and forms acid mist that is hard to capture. Using ~98% H2SO4 avoids misting and gives near-complete absorption before dilution.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#硫酸 #接触法 #吸收
为什么肥皂摸起来滑滑的？
Why does soap feel slippery?
肥皂是碱性的，会和皮肤上的油发生作用，所以摸起来滑滑的。肥皂的碱还能把油污拆成小滴，被水冲走，这就是它能去污的原因。
Soap is basic and reacts with the oil on skin, which makes it feel slippery. Its base also breaks grease into tiny drops that water can wash away, which is how soap cleans.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版化学分册,少年儿童出版社,2013
Ten Thousand Whys: Chemistry volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#肥皂 #滑 #碱
为什么小苏打吃起来涩涩的、不甜？
Why does baking soda taste bitter and not sweet?
小苏打是碱性的，舌头碰到碱会觉得涩，所以它常用来帮忙做蛋糕而不是当糖。小苏打遇酸会冒气泡，这正是它让蛋糕蓬松的秘密。
Baking soda is basic, and the tongue senses base as bitter or soapy, so it is used for baking rather than as a sweetener. With acid it bubbles, which is exactly how it makes cakes fluffy.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版化学分册,少年儿童出版社,2013
Ten Thousand Whys: Chemistry volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#小苏打 #碱 #味觉
为什么胃不舒服吃胃药会觉得好些？
Why does an antacid tablet make a tummy feel better?
胃里太酸了，胃药是碱性的，会和酸中和，酸少了就不难受了。常见的胃药里有碳酸钙之类的碱，专门用来压住过多的胃酸。
The stomach is too acidic; the antacid is basic and cancels the acid, so it feels better. Common antacids contain bases like calcium carbonate that soak up extra stomach acid.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版化学分册,少年儿童出版社,2013
Ten Thousand Whys: Chemistry volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#胃药 #酸碱 #中和
为什么柠檬汁能把发黑的铜器擦亮？
Why does lemon juice polish darkened copper?
柠檬汁里的酸会和铜表面的黑东西（铜锈）反应掉，露出底下亮亮的铜。铜锈大多是氧化铜或硫化铜，碰到酸就溶解，所以柠檬能把它擦亮。
The acid in lemon juice reacts with the dark layer, tarnish, on copper and removes it, showing shiny metal. That tarnish is mostly copper oxide or sulfide, which dissolves in acid, so lemon polishes it clean.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
大连理工大学无机化学教研室 编,《无机化学》第6版,高等教育出版社
Dalian University of Technology Inorganic Chemistry Group, Inorganic Chemistry, 6th ed., Higher Education Press
独立核验依据 · Independent verification: 核验依据 2 ISBN 9787040492750（豆瓣书目条目: 无机化学）
#柠檬 #酸 #铜
为什么做馒头要加一点小苏打或碱？
Why do we add a little baking soda when making steamed buns?
小苏打遇热和面里的酸会放出二氧化碳，让面团里都是小气孔，馒头就松软了。加一点碱还能去掉面酸味，让馒头又松又不发酸。
Baking soda releases carbon dioxide with heat and the dough's acid, making tiny holes so buns turn soft. A little alkali also removes the sour taste, leaving the bun fluffy and not acidic.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
《十万个为什么》第六版化学分册,少年儿童出版社,2013
Ten Thousand Whys: Chemistry volume, 6th ed., Juvenile and Children Publishing House, 2013
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-7-5324-9328-9 · 核验依据 2 ISBN 9787532493289
#小苏打 #蓬松 #气体