sioieng

[匿名]

回覆: 1

2019-03-06 2:49 pm

老爺子, 救救我! 想要配製 PH5.5~6的醋酸鈉緩衝液, 不知要如何配製? 其實我要做的是將醋酸鈉直接攪拌入產品中，未來客戶會將含有醋酸鈉的產品溶入水中，於必要時加入冰醋酸調整，讓醋酸鈉可以自行跟冰醋酸作用，達到穩定ＰＨ值的作用。 問題是如何計算須要加入醋酸鈉的量呢？

[匿名]

回覆: 2

2019-03-05 8:21 pm

已知二次函數通過（5,6）(-3,2) 對稱軸為y，要怎麼求出二次函數？

Smile

回覆: 2

2019-03-04 10:36 pm

若直線l: y=mx+7 與圓c:x^2+y^2+6x-10y+16=0相交,求m的取值範圍?

[匿名]

回覆: 3

2019-02-26 8:18 pm

A cleaning company found that 14 men took 6 h 40 min to clean a large warehouse.?

[匿名]

回覆: 2

2019-02-24 10:59 pm

A solution of 7.50 mg of a small protein in 5.00 mL aqueous solution has an osmotic pressure of 6.850 torr at 23.1°C.?

[匿名]

回覆: 2

2018-04-11 1:29 pm

What is the intermediate? Please help :)?

[匿名]

回覆: 2

2017-10-31 9:33 pm

Chemistry hw problem help!?

[匿名]

回覆: 3

2017-09-05 12:25 am

If the Ksp value of MX,M2X and MX3 are same then find out the solubility order.?

[匿名]

回覆: 4

2017-08-09 12:11 pm

Which atom has the largest ionization energy? multiple choice?

[匿名]

回覆: 3

2017-05-10 1:09 am

express as a function of a positive acute angle cos 213° is equal to A. cos33° B. -cos33° C. cos57° D. -cos57°?

[匿名]

回覆: 1

2016-10-24 4:34 am

ClO- + N2H4+ H2O2NH2OH + Cl- In the above reaction, the oxidation state of chlorine changes from blank to blank?

[匿名]

回覆: 2

2016-08-03 7:09 am

Help! Which change involves nitrogen being oxidized? the answer apparently is D, why? A. N2H4 → NH2 B. NO2 → N2O4 C. NO3 → N2O5 D. N2O → NO?

[匿名]

回覆: 2

2016-07-13 6:26 pm

1 mole of potassium chlorate on heating thermally decompose and excess of aluminium is burnt.How many moles of aluminium oxide are formed?

[匿名]

回覆: 2

2016-03-29 5:04 pm

2a^2b−20ab+50b−2b^3?

[匿名]

回覆: 1

2016-02-14 9:32 am

(2分支3x+1二次方)-3分支1=9分支1?

[匿名]

回覆: 2

2016-01-30 5:56 am

多項式方程式問題，請問如何解答?

[匿名]

回覆: 2

2016-01-21 9:11 am

顏色、光澤、可燃性、密度、熔點、助燃性、溶解度、沸點；上列性質中屬於物理性質的有幾種？

Dan

回覆: 1

2015-12-21 7:48 am

容量分析清洗儀器一問?

[匿名]

回覆: 2

2015-10-02 4:45 pm

想請教一些國一數學的問題(大多是指數律)?

[匿名]

回覆: 2

2015-09-11 3:06 pm

8將長100公分的分成AB BC兩段後 https://www.flickr.com/photos/101292575@N06/20677405414/in/dateposted-public/?

[匿名]

回覆: 2

2015-09-06 5:03 am

高一數學-多項式函數?

[匿名]

回覆: 2

2015-09-06 5:27 am

設a(1,1) b(7,1) C(1,9)三點在坐標平面上,試求三角形ABC之外心座標 (外心為三角形ABC外接圓的圓心)?

[匿名]

回覆: 1

2015-08-28 2:53 pm

相中2條中一數學題目求解答！！！！?

[匿名]

回覆: 5

2015-07-31 7:58 pm

(急)磷酸水溶液的濃度測定

[匿名]

回覆: 3

2015-02-01 2:07 am

Probability

[匿名]

回覆: 3

2015-01-29 2:50 am

離子的生成!求解!!

[匿名]

回覆: 3

2014-09-30 4:44 am

BaSO4&BaSO4會不會沉澱 ???

Y9329124888

回覆: 1

2014-03-12 6:14 pm

DSE Probability MCQ

[匿名]

回覆: 3

2014-03-09 6:22 am

異丙醇 濃度62.5ug/ml相當於多少ppm

Bid

回覆: 3

2014-03-09 12:10 am

急 ! F5 probability唔明 #319

[匿名]

回覆: 2

2014-01-18 11:11 pm

maths question

tired

回覆: 1

2013-11-13 12:53 am

【求完整回答及說明】中二數學題恆等式兩條

[匿名]

回覆: 3

2013-11-08 6:57 am

F.1 math correction

用戶40441

回覆: 1

2013-08-06 1:14 am

唔識做功課14

[匿名]

回覆: 1

2013-08-05 6:28 pm

續多項式的因式分解 求高手幫忙 !

[匿名]

回覆: 3

2013-08-05 6:06 am

化學~關於克原子和莫耳數

[匿名]

回覆: 3

2013-05-11 4:36 am

有甚麼簡單的化學測試能分辨丙-1-醇和丙酸？

日和月

回覆: 4

2013-03-02 4:36 am

Pb(OH)2(aq)+NH3(aq)

Bid

回覆: 1

2013-03-01 8:55 am

急 ! 急! F5 Locus 2 題 9q5?

用戶37276

回覆: 1

2013-02-28 8:19 am

下列敘述何者與非勻相催化作用有關

用戶37276

回覆: 1

2013-02-28 8:17 am

在以下反應Zn(s)+H2SO4(aq)

用戶37276

回覆: 1

2013-02-26 7:30 am

已知ㄧ定溫度及一定壓力某氣體反應之速率為S

用戶31801

回覆: 2

2012-11-29 1:47 am

F.3Math求積法

[匿名]

回覆: 3

2012-09-22 5:59 am

解釋加速度單位

[匿名]

回覆: 2

2012-09-24 1:23 am

解方程~~[請進]急..幫手!!!

呢啲加奶

回覆: 1

2012-09-23 11:03 pm

數學問題教教我

[匿名]

回覆: 4

2012-09-23 10:37 pm

數學~代數(加式)

[匿名]

回覆: 4

2012-08-08 8:37 am

絕對值 問題 請大家幫忙

用戶29701

回覆: 1

2012-08-08 6:37 am

CE maths (urgent) 30 points

用戶25529

回覆: 2

2012-08-01 3:04 am

definite integration x1