应《网络安全法》要求，自2017年10月1日起，未进行实名认证将不得使用互联网跟帖服务。为保障您的帐号能够正常使用，请尽快对帐号进行手机号验证，感谢您的理解与支持！

24小时热门版块排行榜    

小木虫论坛-学术科研互动平台» 网络生活区» 有奖问答 » 有奖问答完结子版 » 求助 焦磷酸性质
31/1返回列表
查看: 420  |  回复: 2
只看楼主 @他人 存档 新回复提醒 (忽略) 收藏    在APP中查看
当前主题已经存档。

yueya2545065

铜虫 (初入文坛)

[交流] 求助 焦磷酸性质

求助  焦磷酸的性质 及如何 检测！！！        谢谢
回复此楼

» 猜你喜欢
1楼 2008-09-26 09:54:52
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

hpyou

铁杆木虫 (小有名气)
★ ★
yueya2545065(金币+2,VIP+0):不太详细 但还要谢谢你
分子式： H2P2O7
CAS号：

性质：无色黏稠液体，久置生成结晶。密度2.04g/cm3(25℃)。熔点61℃。用水稀释易变为正磷酸。易溶于水，其水溶液有强酸性。焦磷酸根遇银盐得白色焦磷酸银沉淀。由正磷酸热至210℃，失水而成焦磷酸。纯焦磷酸可由磷酸氢钠加热得焦磷酸钠，将其溶解，转化成焦磷酸铅沉淀，再通入硫化氢，过滤将滤液真空低温浓缩即得。常用作催化剂，制有机磷酸酯等。
赞一下(1人) 回复此楼
2楼2008-09-26 10:38:12
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zhangquee

至尊木虫 (文坛精英)

爱花不采花，潇洒不乱洒！
★ ★ ★
yueya2545065(金币+3,VIP+0):谢谢
CCD2004上信息

Diphosphoric acid
Synonym(s): Pyrophosphoric acid. Heptaoxodiphosphoric(V,V) acid. P5OP5 acid. Tetrahydrogen -oxo-hexaoxophosphate. -Oxo-hexaoxodiphosphoric acid
CRC Number: HTV84-C
CAS Registry Number: 2466-09-3
(HO)2P(O)OP(O)(OH)2

Molecular Formula: H4O7P2
Molecular Weight: 177.975
Accurate Mass: 177.943229
Percentage Composition: H 2.27%; O 62.93%; P 34.81%
Source/Synthesis: Synth. from H3PO4 + P4O10, or by heating H3PO4 at 100-200
Biological Use/Importance: Present in normal plasma and other biological fluids, bone and teeth. Abnormality in metabolism leads to hypophosphatasia - an inherited bone disease. Many organic derivs. are also biologically important being involved in biological phosphorylations
Dissociation Constant: pKa1 0.8; pKa2 1.8; pKa3 6.04; pKa4 9 (25) pKa3 5.98; pKa4 8.3 pKa3 5.76; pKa4 8.04

RCB_CT,229949Variant: I-form
CRC Number: JNT71-S
Molecular Formula: H4O7P2
Molecular Weight: 177.975
Accurate Mass: 177.943229
Percentage Composition: H 2.27%; O 62.93%; P 34.81%
Physical Description: Orthorhombic, colourless cryst. Metastable
Melting Point: Mp 54.3
Other Data: Converts into form II when heated in sealed tube at 50
RCB_CT,229950Variant: II-form
CRC Number: HTV92-D
Molecular Formula: H4O7P2
Molecular Weight: 177.975
Accurate Mass: 177.943229
Percentage Composition: H 2.27%; O 62.93%; P 34.81%
Physical Description: Orthorhombic, colourless cryst
Melting Point: Mp 71.5
Other Data: Stable at r.t.
RCB_CT,229951Derivative: Tetra-NH4 salt
see Ammonium diphosphate ((NH4)4(P2O7)), HTW32-Q
CRC Number: HTV93-E
RCB_CT,229952Derivative: Tetra-Li salt
see Lithium diphosphate (Li4(P2O7)), HTW35-T
CRC Number: JNT72-T
RCB_CT,229953Derivative: Tetra-Na salt
see Sodium diphosphate (Na4(P2O7)), HTW34-S
CRC Number: HTL80-A
RCB_CT,229954Derivative: Tetra-K salt
see Potassium diphosphate (K4(P2O7)), HTW33-R
CRC Number: HTL64-Y
References:
Inorg. Synth., 1950, 3, 96 (synth, props)
Wakefield, Z. et al., J. Agric. Food Chem., 1962, 10, 344 (props)
Gmelin Handbook Inorg. Chem., Syst. No. 16, 1965, 224
Russell, R.G.G. et al., Br. J. Hosp. Med., 1975, 14, 299 (metab, physiol)
Russell, R.G.G. et al., Clin. Orthop. Relat. Res., 1975, 108, 241 (rev, biol importance)
Fluck, E. et al., Pure Appl. Chem., 1975, 44, 373 (pe)
Geraldes, C.F.G.C. et al., J. Inorg. Biochem., 1989, 37, 213 (P-31 nmr)
赞一下(1人) 回复此楼
一笑而过~
3楼2008-09-26 10:55:52
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 yueya2545065 的主题更新
31/1返回列表
普通表情 龙 兔 虎 猫 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 272求调剂 +3 材紫有化 2026-02-28 3/150 2026-02-28 22:52 by ms629
[考研] 317一志愿华南理工电气工程求调剂 +4 Soliloquy_Q 2026-02-28 5/250 2026-02-28 22:49 by 布什戈们
[考研] 化工专硕348，一志愿985求调剂 +4 弗格个 2026-02-28 6/300 2026-02-28 22:00 by wang_dand
[考研] 292求调剂 +3 yhk_819 2026-02-28 3/150 2026-02-28 21:57 by gaoxiaoniuma
[考博] 26申博 +4 想申博！ 2026-02-26 4/200 2026-02-28 21:37 by limorning
[考研] 264求调剂 +3 巴拉巴拉根556 2026-02-28 3/150 2026-02-28 21:31 by gaoxiaoniuma
[考研] 311求调剂 +8 南迦720 2026-02-28 8/400 2026-02-28 21:30 by gaoxiaoniuma
[考研] 材料类求调剂 +6 wana_kiko 2026-02-28 6/300 2026-02-28 21:20 by gaoxiaoniuma
[考研] 求调剂 +4 repeatt?t 2026-02-28 4/200 2026-02-28 21:16 by gaoxiaoniuma
[考研] 284求调剂 +4 天下熯 2026-02-28 4/200 2026-02-28 21:13 by gaoxiaoniuma
[考研] 085600材料工程一志愿中科大总分312求调剂 +8 吃宵夜1 2026-02-28 10/500 2026-02-28 20:27 by L135790
[考研] 298求调剂 +8 人间唯你是清欢 2026-02-28 11/550 2026-02-28 20:26 by L135790
[考研] 276求调剂 +3 路lyh123 2026-02-28 4/200 2026-02-28 19:45 by 路lyh123
[考研] 0856材料求调剂 +10 hyf hyf hyf 2026-02-28 11/550 2026-02-28 18:50 by 无际的草原
[教师之家] 版面费该交吗 +15 苹果在哪里 2026-02-22 18/900 2026-02-28 18:20 by mibaomingg
[考研] 285求调剂 +5 满头大汗的学生 2026-02-28 5/250 2026-02-28 18:10 by 材料专硕调剂；
[考博] 博士自荐 +3 kkluvs 2026-02-28 3/150 2026-02-28 16:59 by StarAura
[高分子] 求环氧树脂研发1名 +3 孙xc 2026-02-25 11/550 2026-02-28 16:57 by ichall
[考研] 265分求调剂不调专业和学校有行学上就 +4 礼堂丁真258 2026-02-28 6/300 2026-02-28 16:18 by 求调剂zz
[硕博家园] 【博士招生】太原理工大学2026化工博士 +4 N1ce_try 2026-02-24 8/400 2026-02-26 08:40 by N1ce_try
信息提示
关闭
请填处理意见
关闭