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【简答题】
氰化物溶液在提炼金矿中广泛使用，然而氢氰酸蒸气是剧毒的，如果暴露在大气中的氢氰酸蒸气浓度超过100×10 -6 (体积分数，相当于100ppm)，经过30～60min就可致人死亡。在一个黄金提炼厂内，是采用石灰来保证约0.1mol·kg -1 的氰化钾的pH不至于下降至某一临界值。试估算在放有一大桶氰化钾溶液的不通风的房间内的初始浓度b(CN - )。已知纯HCN(液态)的正常沸点为26℃。
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