請問這題為什麼D選項的鋁跟錳離子可溶呢

2+ 12. Consider a solution containing the following cations: Na, Hg²+, Mn²*, Al³+ and Ag. Treatment of the solution with dilute HCl followed by saturation with H₂S results in formation of precipitate(s). Which ions still remain in solution ? Hg Cut Pb Agt TI 7 DE TA. 2A, NH4+ J + + (A.) Ag only; (B.) Na*, Hg²+, Al³+; (C.) Ag* and Hg²+; Na+, Al³+, and Mn²; Nat only

請問這題酸鹼滴定要怎麼算 卡了很久還是想不出來 如果是當量點的話H+ OH-莫耳數不是相同嗎 這樣不是PH=PKa嗎

BA 48. Calculate the pH at the equivalent point in the titration of 40ml of 0.025M benzoic ↳ 苯甲酸 CH602 84+6+32 acid(Single proton acid) with 0.5M NaOH. (Ka of benzoic acid = 6.3x10-5) A6.50 (B) 8.21 (C)10.01 (D) 7.30 [base). PH= Pka + hoy (12121212 = Pkat bay Tacid) (m) mx份起 0.025x0,04x122 122 .C-OK =122

11.救一下感恩

(A) [OH]> [H] (B) [H] > [OH ] (C) the water is no longer neutral (D) none of these is correct. 11. A 100.0-mL sample of 0.2 M (CH3)3N (Kb = 5.3 x 105) is titrated with 0.2 M HCI. What is the pH at the equivalence point? (A) 5.4 (B)7.0 (C) 10.3 (D) 3.1 (E) 9.9 17 You have a solution of 0 10 MC5 and 0.10 M Cr0.² You add 0 10 M silver nitrate dropwise into

第二張是解答，問最後一個步驟，怎麼看？

7-72 Reaction of 2,3-dimethyl-1-butene with HBr leads to an alkyl bromide, addin C6H13Br. On treatment of this alkyl bromide with KOH in methanol, form a elimination of HBr occurs and a hydrocarbon that is isomeric with the ber starting alkene is formed. What is the structure of this hydrocarbon, -mote and how do you think it is formed from the alkyl bromide? qedo eidt al .equory Janoitonut Tojem ent to noitqirozeb aus s eaupaib Il'ow aquo Ismoitonul red in related

題目跟解答在講什麼😅

7-65 tert-Butyl esters [RCO₂C(CH3)3] are converted into carboxylic acids (RCO₂H) by reaction with trifluoroacetic acid, a reaction useful in pro- tein synthesis (Section 26-7). Assign E,Z designation to the double bonds of both reactant and product in the following scheme, and explain why there is an apparent change in double-bond stereochemistry: H C-OCH3 C-OCH3 CF3CO2H C=C + H2C=C(CH3)2 H3C C-OC(CH3)3 C-OH 0- H3C

求解 可以告訴我這個式子要怎麼平衡嗎

of the permanganate solution to completely with 0.352 go for the reaction is acidic Mn04 (aq) + H2C204(aq) Mn2+ (aq) + CO2(g)

請問38題要怎麼算？

atr Ultitie 36. 酸鹼滴定時,降低測量的隨機不準度之最佳方法為何?(A)重置滴定(B)確保眼睛與滴定管中液面之半月形等高 (C)使用不同的滴定管 (D)使用不同的西餐鹼指示劑 A 37. 環境荷爾蒙均具有高沸點、高脂溶性以及不易分解的特性。若欲從河底淤泥中萃取多溴二苯酚以供檢測,則下列 那種溶劑最為合適?(A)純水(B)氨水(C)食鹽水(D)乙酸乙酯 0 38. 磷酸(HSPO.)的三個游離常數分別為 Kal = 7.5 x 10-3; Kap = 6.2 x 10-8; Kas = 4.8 x 10-13)。若想要配製 pH約為7.0的 緩衝溶液,下列何者的組合最適合? (A) H3PO4、H2PO4 (B) H2PO4、HPO4^ (C) HPO、PO: (D) HAPO: B PO3- 39. 蟑螂腹部呼吸孔的附近,有一層光亮透明的防水油膜,當蟑螂掉入水中時,仍能游離水面逃生。若蟑螂掉入合清 潔劑的水溶液中,則會在短時間內死亡。下列何者為其致死原因的最合理推測?(A)被氣泡死(B)該水溶液。 有磷酸鹽,毒死蟑螂 (C)該水溶液溶解防水油膜,造成呼吸進水,室息而死(D)該水溶液的鈣離子進入呼吸孔 造成呼吸孔膨脹而使蟑螂死亡 0. 已知坊間所賣的光觸媒,其主要成分是奈米級的二氧化鈦,而其吸收光之波長至少需低於400 nm。吸收光能後 二氧化鈦具有相當強之氧化力,可以將吸附在物質表面之污染物直接氧化,使其分解,或者將吸附於物質表面 水分子氧化為氫氧自由基(H2O →·OH + H' +e)進而分解污染物。下列敘述,何者正確?(A) OH 為強氧化 可以分解污染物(B) 奈米級的顆粒大小,是比原子更小(C)光觸媒在黑暗中,仍有消毒效果 (D)氫氧自由基 的氧原子之雷子恰好是八團體組能

求解第10題🙇🏻‍♀️ 答案是D

二 eg 說 JO) Determine the velocity of amarble (m =8.66 g) with a wavelength of 3.46 x 10-33 m. 10) A) 38.8 m/s B) 45.2 m/s 所) He D) 22.1 m/s E) 52.9 m/s

關於 軌域 量子數

和 ,, 、 , 吧 eXact paths for clectron rmnotton. 0 人. 能殉如品 疚兩核型正確地負放原他結福 、 gliving a description of the atotnic 和 Bohrmodel. D. 使科學家能準確計算出 氣原子的糖4 allowing scientists to calcutate an 扎 和海森堡的測不準原理抵觸。 conflict with the Heiusen L 7. 下列何者為一個電子在九 VWhich ofthe following ls Orbita1? AA. 到三人3,二35 3明潑4筆拉 C. zz一4二un0e 已 有和90

錯合物 我想知道 ABDE

3. 下列有關錯合 人 六 = 寺 -. 上2714介六井口(日獎盡 Which of the following statement 1S Correct? 《 (A) [Ni(CO)4]的形狀為四面体 (The shape of [Ni(CO)4] is tetrahedra1) (B) EDTA+“有四牙配位子 (EDTA+ has four coordination sites) (S) 葉綠素是含有Fe 離子的一種錯合物 (Chlorophyll is complex contalning Fe7 ion) (D) CH能當作配位子與金屬離子生成錯合物 (CH can be aligand to form abond With metal ion) (E) 錯合物[VO2(H2O)4] 中心金屬原子的氧化數及配位數分別為+$、4 The oxidation and coordination number for the metal atom of「VO2(HpO)4| are +5 and 4, respectively