Potassium biphthalate

MDL：
--MFCD00013070

Molecular Formula：
C8H5KO4；HOOCC6H4COOK

Molecular Weight：
204.22

Alias：
苯二甲酸氢钾,酞酸氢钾,1,2-苯二甲酸单钾盐 Potassium phthalate monobasic KHP Phthalic acid monopotassium salt Potassium hydrogen phthalate

Product order：

Name	Specifications	Packing	Price	Delivery
Potassium biphthalate	HPLC，>99.5%	250g	RMB 638	Consulting service
Potassium biphthalate	HPLC，>99.5%	50g	RMB 184.8	Consulting service
Potassium biphthalate	ACS, 99.95-100.05%	500g	RMB 140.8	Consulting service
Potassium biphthalate	GR	500g	RMB 85.8	Consulting service
Potassium biphthalate	AR	500g	RMB 74.8	Consulting service

Character：
无色单斜结晶或白色结晶性粉末。在空气中稳定,能溶于水，微溶于醇。溶于约12份冷水、3份沸水，微溶于乙醇。溶液呈酸性。25℃ 0.05mol/L水溶液的pH为4.005。
密度:1.636
熔点:295～300℃

Quality Standard：
   
   GB/T1291-88
项目ltem                                 分析纯
                                          (AR)
含量(C8H5KO4)Assay,%                   ≥ 99.8
pH(50g/L溶液,25℃)pH of water solution    3.8-4.2
澄清度试验Clarity                         合格
水不溶物lnsoluble matter in water,%    ≤ 0.005
干燥失重Drying loss,%                  ≤ 0.05
氯化物(Cl)Chloride,%                   ≤ 0.002
总氮量(N)Total nitrogen,%              ≤ 0.006
铵(NH4)Ammonium,%                      ≤ 0.005
钠(Na)Sodium,%                         ≤ 0.01
铁(Fe)Iron,%                           ≤ 0.0005
重金属(Pb)Heavy metals,%               ≤ 0.0005

Q/(HG)SJ783-1999
项目ltem                                 化学纯
                                          (CP)
含量(C8H5KO4)Assay,%                   ≥ 99.0
pH(50g/L溶液,25℃)pH of water solution    3.8-4.2
澄清度试验Clarity                         合格
水不溶物lnsoluble matter in water,%    ≤ 0.01
氯化物(Cl)Chloride,%                   ≤ 0.01
硫化合物(以SO4计)Sulfur compounds,%    ≤ 0.0012
铵(NH4)Ammonium,%                      ≤ 0.01
钠(Na)Sodium,%                         ≤ 0.1
铁(Fe)Iron,%                           ≤ 0.002
重金属(Pb)Heavy metals,%               ≤ 0.001

GB1257-89
项目ltem                                 基准试剂
                                           (PT)
含量(C8H5KO4)Assay,%                   ≥ 99.95～100.05
pH(50g/L溶液,25℃)pH of water solution    3.8-4.1
澄清度试验Clarity                         合格
水不溶物lnsoluble matter in water,%    ≤ 0.003
氯化物(Cl)Chloride,%                   ≤ 0.002
硫化合物(以SO4计)Sulfur compounds,%    ≤ 0.006
钠(Na)Sodium,%                         ≤ 0.005
铁(Fe)Iron,%                           ≤ 0.0005
重金属(Pb)Heavy metals,%               ≤ 0.0005

ACS级
项目名称　                              ACS Grade
含量(C8H5KO4,干基)Assay                99.95-100.05%
pH(5%溶液,25.0±0.2℃)
pH(5% solution at 25.0±0.2℃)         4.00-4.02
水不溶物Insoluble matter               ≤0.005%
氯化合物(Cl)Chloride compounds         ≤0.003%
硫化合物(以SO4计)Sulfur compounds      ≤0.002%
重金属(以Pb计)Heavy metals             ≤ 5ppm
铁(Fe)Iron                             ≤5ppm
钠(Na)Sodium                           ≤0.005%

品级Grade                               色谱纯  
                                     (grade for HPLC )
含量assay                             ≥99.8% (T)
pH                                    3.5-5.0
熔点mp                                295-300 °C (dec.)  
水溶解试验solubility H2O:             soluble100 mg/mL, 无色透明
λ 10 % in H2O
UV absorption
  λ: 330 nm A:                        ≤0.05
  λ: 340 nm A:                        ≤0.03
  λ: 350 nm A:                        ≤0.02
  λ: 500 nm A:                        ≤0.02

Storage：
密封保存。
用途  分析试剂。标定碱的基准物，配制缓冲溶液