Respuesta :
The correct steps in order from first to last for confirming the presence of lead(ii) ions in a sample is i, iv, ii, vi, viii, iii, vi, v.
The chemical element of lead ion has the atomic number 82 and the letter Pb. It is a hefty metal with a higher density than the majority of everyday materials. Its melting point is rather low, and lead is soft and flexible. lead ion is a lustrous, slightly blue-tinged grey when it is first cut. A sample is a representative piece or one object taken from a bigger whole or group, especially when it is offered for inspection or displayed as proof of quality: specimen. A sample is a selection of individuals, things, or things used in study that is used for measurement out of a wider population. In order to be able to extrapolate the results from the research sample to the entire population, the sample must be representative of the population.
the complete question is:
place the steps in order from first to last for confirming the presence of lead(ii) ions in a sample.
i) The formation of a white and black precipitate confirms the presence of lead(II).
ii) Decant the liquid above the white precipitate and add hot water to the white precipitate.
iii) Decant the liquid and add K, CrO, to the liquid.
iv) Add HCI to the sample.
v) The formation of a yellow precipitate confirms the presence of lead(II).
vi) Decant the liquid and add HNO, to the liquid.
vi) Decant the liquid and add NH, to the white precipitate.
viii) The formation of a white solid confirms the presence of lead(II).
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