27
Yes filtering is necessary as thiocyanate can complex the solid silver chloride per:
$$\ce{AgX_{(s)} + SCN-_{(aq)} -> Ag[SCN]X-_{(aq)}\tag{X = Cl, Br, I}}$$
This additional reaction requires more thiocyanate for back titration and thus gives a lower chloride concentration than is true.
More
VOTE
2026-08-22
Yes filtering is necessary as thiocyanate can complex the solid silver chloride per:
$$\ce{AgX_{(s)} + SCN-_{(aq)} -> Ag[SCN]X-_{(aq)}\tag{X = Cl, Br, I}}$$
This additional reaction requires more thiocyanate for back titration and thus gives a lower chloride concentration than is true.
Yes filtering is necessary as thiocyanate can complex the solid silver chloride per:
$$\ce{AgX_{(s)} + SCN-_{(aq)} -> Ag[SCN]X-_{(aq)}\tag{X = Cl, Br, I}}$$
This additional reaction requires more thiocyanate for back titration and thus gives a lower chloride concentration than is true.
More
VOTE