题目内容

取0.1mol·L－1某一元弱酸溶液50mL与 20mL0.1mol· L－1KOH溶液混合，将混合溶液稀释到100mL，测此溶液pH值为5.25，此一元弱酸的电离常数K= 。

查看答案

搜索结果不匹配？点我反馈

更多问题

要配制450L,pH=9.30的缓冲溶液需要0.10mol/L氨水和0.10mol/L盐酸各多少L?（NH3的Pkb=4.74）

配制1LpH=5的缓冲溶液，如果溶液中HAc浓度为0.20mol/L，需1mol/L的NaAc和1mol/L的HAc各多少升？

1.over a week ago, the books are expected to arrive any time now.A．Ordering B．Toorder C．Havingordered D．Ordered2.with the size of the whole earth，the biggest ocean does not seem big atall.A．Compare B．WhencomparingC．Comparing D．Whencompared3.it easier to get in touch with us, you’d better keep this card at hand.A．MadeB．MakeC．MakingD．Tomake4.The area nearthetown,5 kilometers by 3 kilometers, has been bought by the foreigncompany.A．tomeasureB．measuredC．measuringD．being measured5.During the Mid-Autumn Festival, family members often gathertogethera meal, admire the moon and enjoy moon cakes.A．shareB．toshareC．havingshared D．Shared6.Jim has retired, but he still remembers thehappytimewith hisstudents.A．tospendB．spendC．spendingD．spent7.the past year as an exchange student in Hong Kong, Linda appears more mature than those of herage.A．SpendingB．SpentC．HavingspentD．Tospend8.Beijing Opera to the basic education in China is a big step to promote traditionalart.A．AddingB．AddedC．AddD．Havingadded9.the early flight, we ordered a taxi in advance and got up veryearly.A．CatchingB．CaughtC．TocatchD．Catch10.Clearlyandthoughtfully, the book inspires confidence in students who wish to seek their ownanswers.A．writingB．towriteC．writtenD．beingwritten11.nearly all ourmoney,we couldn't afford to stay at a hotel.A．HavingspentB．TospendC．SpentD．Tohavespent12.basic first-aid techniques will help you respond quickly to emergencies.A．Known B．HavingknownC．KnowingD．Beingknown

三、用单词的适当形式完成句子27．Jason is saving a sum of money (buy) a new house for his family.28．People value EQ much more than before, believing it is EQ ___ gets uspromoted.29．_ (absorb) in writing his new novel, Steve didn’t notice evening approaching.30．In art criticism, you must assume that the artist has a message _(hide) within his/her work.31．_ the important exam around the corner, I became busier and busier.32．During your life journey, some people you meet may let you down _more will help you grow.33．I’m tired out. I stayed up the whole night, _(study) for my project due today.34．If I hadn’t met Jim in the library that day, I _ (miss) the chance of owning a true friend.35.Life is like a race we all compete with ourselves against time.36.Praise not only brings joy to those who ___ (praise) but also adds pleasure to those who praise.