学年

教科

質問の種類

英語 高校生

英語 これの答えなんだと思いますか?解いてみたのですが答えがなくて自信がありません。15番の選択肢は①ago ②from now ③past ④in です。 答えだけでかまいませんお願いします🙇‍♀️

A frosty Novemper morning decorates the leafless trees to perfection. When I went up the hill, the white frost was sparkling, and the of milky mist hanging in the air. 6 trees arose on all sides. There were layers The frost has not yet taken to lingering* on the trees in the morning. The air was soon mild. When I went to plant a new tree just received from the nursery*, a gentle moistnes prevailed. Planting trees is pleasant work, encouraging I dug the hole, the soil moved easily beneath the spade, soft and damp. thought about the future, and especially 7 so when conditions are as favorable as this. The weak roots settle 9 into the loam and compost and bone-meal*, pressed into the pit that has been dug; and the infant" thing, little more than a twig, is magnified in the 10 into a handsome and graceful maturity. The village has responded readily 11 the urgings* to plant more trees. In various corners single saplings* are being installed; where more space is available, groups are being planted. A decision as to 12 is not arrived at without much discussion, opinion being split, in general terms, between decorative exoties which put on a great show of blossom and those less showy trees, unfortunately slower in growth, which are more 13 to the village scene. To my relief the latter choice has been preferred. My immediate contribution has been to plant on the grassy edge of the lane which passes my house. 14 there is no room_for anything tall, I chose a white hawthorn*, and as I set it in the earth I could picture it giving pleasure to people who will walk along this lane many years 15 long after I am dead. [注] linger「とどまる」、nursery「苗床」 loam and compost and bone-meal 「黒土(ローム)と堆肥と骨粉」 infant「未発達の」、urging「奨励」、sapling「苗木」、 hawthorn 「セイョウサンザシ」 問6 0 green 2 rich 3 bare fallen 6 問7 0 Below As ③ Though Above 7 間8 0 for 2) dark ③ pessimistic の optimistic 8 問9 0 up hard unresistingly with difficulties 9 問10 0 imagination 2 real ③ future の life 10 問11 0 for ③ to by 11 on 問12 0 the way of planting の what to plant ③ how to plant 0 plant or not 12 問13 の traditional 2 colorful ③ dangerous 0 against 13 問140 If As long as 3 Unless Since 14

回答募集中 回答数: 0
化学 高校生

なぜこのような式が出てくるか分からないので教えて欲しいです。なぜ、酢酸とそのイオンの分数式が出てくるのですか?

Tog 発展例題* 76緩衝液の pH 酢酸と酢酸ナトリウムの混合溶液(緩衝液)がある。次の問いに答えよ。ただし, 酢酸の電離定数を K。= 1.0 × 10-47 mol/L, 107 =5とする。 (1) 酢酸 0.10 mol と酢酸ナトリウム 0.10 mol を含む1.0Lの混合溶液の pH はいくらか。 (2) 混合溶液のpH が4のとき,酢酸と酢酸ナトリウムのモル濃度の比はいくらか。 II101 / L 補足小新宿 混合溶液中の酢酸のモル 濃度をc[mol/L),酢酸ナ トリウムのモル濃度を 考え方」 (1) CH3COOH e CHaCOO-+ H+ より, (大) K,= [CHCOO-][H+] [CH3COOH] を[H+]=口に変形。 CH3COO- は,酢酸と酢酸ナトリウムの両方から電離して生 じるが、酢酸の電離度が非常に小さいので,ほぼすべてが酢酸 |c'[mol/L]とすると、 宝ナトリウムから生じたと考えてよい。 C あ 務木O Jm 00a [H+]=K,× (mol/L] が成り立つ。 「題また,[CH3COOH]は,酢酸の電離度が非常に小さいので、om はじめの酢酸の濃度と同じと考えてよい。 岩小で士ま [CH3COOH] [CH3COO-] pH=-logio[H+]=-logio 10-47=4.7 STゆト (2) pH=4だから,[H+]=1.0×10-4 mol/L [H+]=1.0×10-47 mol/LX 0.10 mol/L 0.10 mol/L 解答 -= 1.0 × 10-47 mol/L× =1.0× 10-47 mol/L [CH.COOH] [CHCOO-] -=1.0×10-*mol/L 10-4 = 107 =5 [CH3COOH] [CHCOO-] したがって,酢酸:酢酸ナトリウム = 5:1 よって、 10-4.7 dgol Dugol= 0gol S 2CC

解決済み 回答数: 1