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Chemistry Senior High

(a)+7のところで酸化数の数の出し方を式と一緒に教えてください。

例題 25 酸化還元反応 135,136 2+IONS 酸性の過マンガン酸カリウム水溶液に二酸化硫黄を吹きこんだときの反応につい て、次の文の( )に適当な酸化数,数値,語句, 化学式を入れよ。 JOSM PMS TH JO+SM (2) 102 過マンガン酸イオン MnO4- 中の Mn の酸化数は(a)で, 酸性溶液では MnO²-1個は相 手の物質から電子(b)個を奪って酸化数 (c) の Mn²+ になる。 MnO4- +8H+ + (b) e- → Mn²+ + 4H2O …..① 一方,二酸化硫黄は, SO2 分子1個が (d) 個の電子を相手の物質に与えて SO²になる。 このとき,SO2中のSの酸化数は, (e)から(f) に変化する。 your 201 SO2 + 2H2O →→→→SO₂2² + 4H+ +(d)e¯ Hа+on …② 08+ 酸化還元反応において, (g)剤が失うe の数と(h)剤が受け取る e-の数は常に等 しいので, ①式を(i) 倍,②式を(j)倍して各辺を加えてe を消去すると,次のイオ ン反応式が得られる。 $02+0HS+ 08 HS+10 ( 20 INNS (k) MnO + (1) SO2 + (m)H2O → (n) Mn²+ + (o) SO² + (p)H+ 2+ 3 ③式の両辺に変化しなかったイオンの2K+ を加えて整理すると, 酸化剤である (q)と J 収 還元剤である (r) の反応の化学反応式が得られる。 2KMnO4 + 5SO2 +2H2O- K2SO4 +2MnSO4 +2H2SO4 指針 酸化剤:e™ を他から奪い,酸化数が減少する原子を含む物質 還元剤:eを他に与え, 酸化数が増加する原子を含む物質HIHS 1m HOM+IOH (d) OHS 酸化還元反応では, 酸化剤が受け取るeの物質量=還元剤が失うe の物質量となる。 e- を Undt's H 消去してイオン反応式を得る。・・・③式 解答 (a) +7 (b)5 (c) +2 (k) 2 (1) 2 It) (j) 5 (9) KMnO4 (r) SOz (d) 2 (1) 5 (e) +4 (m) 2 解説動画 (f) +6 (n) 2) 火入れ上 (g) 還元 (0) 5 (h)酸化 (P) 4 eε OS JO + 1S.

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Chemistry Senior High

【英語ですみません】最後の12番は何を書いたら良いのでしょうか…? Video C の実験では、aqueous solution にlead(ii) nitrate, aqueous solution にPottasium iodide を入れていました。 2KI (aq)... Read More

With lead (I) nitrate solution. This precipitation reaction produces a bright yellow solid. (point values in parentheses) Part 1: 1. Copy the unbalanced reaction below into your lab notebook. Balance the reaction by adding coefficients. (1) KI (aq) Pb(NO,), (aq) KNO, (aq) Pbl, (s) 2. a) Which trial are you assigned? b) Copy the data table below into your notebook. Watch video A (make sure it's the correct trial!) and collect your data. You may need to pause or rewatch the video, it goes quickly. (1.5) Mass of Empty Beaker (g) Mass of Beaker+ solid Pb(NO,)。(g) Volume of 1.0 M KI (aq) (mL) For the following calculations, show all your work for full credit. 3. What mass of solid Pb(N0,), was added to the beaker? (1) 4. If the solid Pb(NO,), was dissolved in 45 mL of water, what is the molarity of the Pb(NO,)。 solution? (2.5) 5. Which compound is the limiting reactant? (4) 6. What mass of lead (II) iodide (PbL,) should be produced? (2) Part 2: 7. Watch video B (make sure it's the correct trial!) to see the complete reaction and collection of the product. Copy the data table below and record your data. (1) Mass of filter paper (g) Mass of filter paper + dried precipitate (g) 8. What mass of precipitate was collected? Show your work. (1) Calculate the percent yield for the reaction. Show your work. (2) 10. For your trial, which three ions were present in the filtered solution at the end of the reaction? In other words, which three ions are still dissolved at the end of the reaction? Defend/explain your 9. answer. (3) 11. Watch video C - watch both tests for your trial and record your observations. (1) a) Add lead (II) nitrate - b) Add potassium iodide - 12. These tests were conducted to prove the identity of the limiting reactant. Considering your answers to the previous two questions, describe how these tests support the prediction you made in question 5 about which compound is the limiting reactant. (2)

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