As of 2022-03-07, the Wikidata property pKa (P1117) is used on 208 items as main value on statements (not counting qualifiers) of the Q and P namespaces.

Closest properties: by cardinality of intersection, by Jaccard index.

Display properties of the following types:                                    

Closest properties by cardinality of intersection

IDLabelIntersection cardinalityJaccard index
P274 chemical formula 208
 0.0002
P31 instance of 208
 0.0000
P234 InChI 207
 0.0002
P235 InChIKey 207
 0.0002
P2067 mass 206
 0.0006
P233 canonical SMILES 206
 0.0002
P231 CAS Registry Number 206
 0.0002
P662 PubChem CID 206
 0.0002
P661 ChemSpider ID 201
 0.0016
P8494 DSSTOX compound identifier 199
 0.0002
P3117 DSSTox substance ID 199
 0.0002
P2566 ECHA InfoCard ID 181
 0.0033
P232 EC number 181
 0.0033
P652 UNII 173
 0.0025
P592 ChEMBL ID 164
 0.0033
P117 chemical structure 154
 0.0095
P7049 AICS Chemical ID (former scheme) 153
 0.0093
P683 ChEBI ID 146
 0.0014
P646 Freebase ID 145
 0.0000
P6366 Microsoft Academic ID 140
 0.0005
P679 ZVG number 138
 0.0191
P2101 melting point 127
 0.0041
P373 Commons category 125
 0.0000
P2840 NSC number 123
 0.0011
P4964 SPLASH 122
 0.0155
P1579 Reaxys registry number 122
 0.0063
P2062 HSDB ID 119
 0.0204
P6689 MassBank accession ID 113
 0.0102
P665 KEGG ID 113
 0.0056
P1578 Gmelin number 112
 0.0350
P527 has part or parts 110
 0.0002
P10283 OpenAlex ID 109
 0.0011
P703 found in taxon 106
 0.0000
P3636 PDB ligand ID 97
 0.0044
P657 RTECS number 92
 0.0505
P8408 KBpedia ID 91
 0.0024
P715 DrugBank ID 90
 0.0073
P2057 Human Metabolome Database ID 89
 0.0142
P4952 safety classification and labelling 88
 0.0575
P2054 density 87
 0.0536
P1417 Encyclopædia Britannica Online ID 84
 0.0005
P227 GND ID 84
 0.0001
P3345 RxNorm ID 83
 0.0089
P486 MeSH descriptor ID 83
 0.0022
P2102 boiling point 77
 0.0736
P5220 ICSC ID 77
 0.0432
P244 Library of Congress authority ID 69
 0.0001
P3073 CosIng number 66
 0.0126
P638 PDB structure ID 65
 0.0024
P361 part of 65
 0.0000

Closest properties by Jaccard index

IDLabelIntersection cardinalityJaccard index
P2203 upper flammable limit 35
 0.0983
P2202 lower flammable limit 35
 0.0895
P2201 electric dipole moment 21
 0.0864
P1109 refractive index 29
 0.0836
P2128 flash point 46
 0.0799
P2260 ionization energy 36
 0.0769
P2102 boiling point 77
 0.0736
P2199 autoignition temperature 18
 0.0698
P2129 immediately dangerous to life or health 39
 0.0690
P2119 vapor pressure 52
 0.0661
P3070 dynamic viscosity 14
 0.0593
P695 UN number 39
 0.0579
P4952 safety classification and labelling 88
 0.0575
P2404 time-weighted average exposure limit 42
 0.0569
P2407 short-term exposure limit 18
 0.0556
P1931 NIOSH Pocket Guide ID 47
 0.0537
P2054 density 87
 0.0536
P8121 UM-BBD compound ID 58
 0.0536
P4149 conjugate base 28
 0.0528
P657 RTECS number 92
 0.0505
P3078 standard enthalpy of formation 21
 0.0483
P2177 solubility 27
 0.0455
P5220 ICSC ID 77
 0.0432
P8491 AHECC 2017 ID 15
 0.0427
P2993 partition coefficient water/octanol 9
 0.0385
P1578 Gmelin number 112
 0.0350
P5076 Römpp online ID 58
 0.0342
P2240 median lethal dose (LD50) 9
 0.0318
P2107 decomposition point 13
 0.0315
P2075 speed of sound 8
 0.0308
P1820 Open Food Facts food additive ID 16
 0.0296
P2300 minimal lethal dose 7
 0.0295
P700 Kemler code 7
 0.0279
P8224 molecular model or crystal lattice model 51
 0.0274
P3013 surface tension 6
 0.0269
P2116 molar enthalpy of vaporization 6
 0.0268
P2405 ceiling exposure limit 10
 0.0265
P628 E number 18
 0.0233
P3071 standard molar entropy 6
 0.0226
P1987 MCN code 20
 0.0220
P9557 JECFA number 38
 0.0217
P2062 HSDB ID 119
 0.0204
P4599 monomer of 5
 0.0202
P9066 FL number 50
 0.0195
P679 ZVG number 138
 0.0191
P2085 Nikkaji ID 15
 0.0189
P2056 specific heat capacity 4
 0.0185
P2117 combustion enthalpy 4
 0.0184
P2072 CDB Chemical ID 4
 0.0183
P873 phase point 4
 0.0176