Lead sulfide - Ryukanamari (English spelling)

Japanese: 硫化鉛 - りゅうかなまり（英語表記）lead sulfide

The chemical formula is PbS. It occurs naturally as galena and with other sulfide minerals. Only divalent lead compounds are known. It can be obtained as a black precipitate by passing hydrogen sulfide through an aqueous solution of lead(II) compounds or by adding thiourea to an aqueous solution of lead(II) acetate while heating it. It has a cubic crystal system with a sodium chloride structure and a melting point of 1114°C. Its density is 7.59 g/cm3. It is practically insoluble in water, with a solubility of about 8.6× ^10-5 g per 100 g of water at 18°C. It is practically insoluble in dilute hydrochloric acid and dilute sulfuric acid, but is soluble in nitric acid.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

化学式PbS。天然には方鉛鉱として，また他の硫化鉱物とともに産出する。2価の鉛の化合物のみが知られている。鉛(II)化合物の水溶液に硫化水素を通じるか，酢酸鉛(II)水溶液を加熱しながらチオ尿素を加えると，黒色の沈殿として得られる。等軸晶系で塩化ナトリウム型構造をもち，融点1114℃。密度は7.59g/cm3。水にはほとんど不溶で，水100gに対する溶解度は18℃で8.6×10^－5g程度。希塩酸，希硫酸にはほとんど溶けないが，硝酸には溶ける。

出典　株式会社平凡社世界大百科事典第２版について　情報

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