In the top space write formula for each substance formed when the following ion pairs are mixed. Use the bottom space to describe any visible change, i.e., white precipitate formed, solution turns red, etc. If no visible change occurs, leave the space blank.

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Solution

Cations

Reagent added
$P b^{2 +}$

$C u^{2 +}$

$F e^{3 +}$

$C o^{2 +}$

$Z n^{2 +}$

$M g^{2 +}$

$B a^{2 +}$

$K^{+}$

$(N H_{4})_{2} S O_{4}$

$P b S O_{4}$

$C u S O_{4}$

$F e_{2} (S O_{4})_{3}$

$C o S O_{4}$

$Z n S O_{4}$

$M g S O_{4}$

$B a S O_{4}$

$K_{2} S O_{4}$

White ppt
Blue ppt

Yellow

Reddish pink

White

white

White

White

$(N H 4)_{2} S$

PbS

CuS

$F_{e} 2 S_{3}$

CoS

ZnS

MgS

BaS

$K_{2} S$

Black

Black

Yellow
green

Black

White

white
to reddish brown

Colourless

Colourless

NaI
(Petroleum ether)

$P b I_{2}$

$C u I_{2}$

$F e_{2} I_{3}$

$C o I_{2}$

$Z n I_{2}$

$M g I_{2}$

$B a I_{2}$

KI

Bright
yellow

Black
or yellow

white

White

White

white

$N H_{4} S C N$

$P b (S C N)_{2}$

$C u (S C N)_{2}$

$F e_{2} (S C N)_{3}$

$C o (S C N)_{2}$

$Z n (S C N)_{2}$

$M g (S C N)_{2}$

$B a (S C N)_{2}$

KSCN

White
or light yellow

NaOH
(Limited amount)

$P b (O H)_{2}$

$C u (O H)_{2}$

$F e (O H)_{3}$

$C o (O H)_{3}$

$Z n (O H)_{2}$

$M g (O H)_{2}$

$B a (O H)_{2}$

KOH

$N a_{2} P b O_{2}$

NaOH
(Excess amount)

$N a_{2} Z n O_{2}$

$N H_{3}$ (aq)
(Limted amount

$N H_{3}$ (aq)

(excess
amount)

$[P b (N H_{3})_{4}] S O_{4}$

$[C u (N H_{3})_{4}] S O 4$

$[F e (N H_{3})_{6}]_{2} (S O_{4})_{3}$

$[C o (N H_{3})_{4}] S O_{4}$

$[Z n (N H_{3})_{4}] S O_{4}$

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Reagent added	$P b^{2 +}$	$C u^{2 +}$	$F e^{3 +}$	$C o^{2 +}$	$Z n^{2 +}$	$M g^{2 +}$	$B a^{2 +}$	$K^{+}$
$(N H_{4})_{2} S O_{4}$	$P b S O_{4}$	$C u S O_{4}$	$F e_{2} (S O_{4})_{3}$	$C o S O_{4}$	$Z n S O_{4}$	$M g S O_{4}$	$B a S O_{4}$	$K_{2} S O_{4}$
$(N H_{4})_{2} S O_{4}$	White ppt	Blue ppt	Yellow	Reddish pink	White	white	White	White
$(N H 4)_{2} S$	PbS	CuS	$F_{e} 2 S_{3}$	CoS	ZnS	MgS	BaS	$K_{2} S$
$(N H 4)_{2} S$	Black	Black	Yellow green	Black	White	white to reddish brown	Colourless	Colourless
NaI (Petroleum ether)	$P b I_{2}$	$C u I_{2}$	$F e_{2} I_{3}$	$C o I_{2}$	$Z n I_{2}$	$M g I_{2}$	$B a I_{2}$	KI
NaI (Petroleum ether)	Bright yellow			Black or yellow	white	White	White	white
$N H_{4} S C N$	$P b (S C N)_{2}$	$C u (S C N)_{2}$	$F e_{2} (S C N)_{3}$	$C o (S C N)_{2}$	$Z n (S C N)_{2}$	$M g (S C N)_{2}$	$B a (S C N)_{2}$	KSCN
$N H_{4} S C N$	White or light yellow
NaOH (Limited amount)	$P b (O H)_{2}$	$C u (O H)_{2}$	$F e (O H)_{3}$	$C o (O H)_{3}$	$Z n (O H)_{2}$	$M g (O H)_{2}$	$B a (O H)_{2}$	KOH
NaOH (Limited amount)	$N a_{2} P b O_{2}$
NaOH (Excess amount)					$N a_{2} Z n O_{2}$
NaOH (Excess amount)
$N H_{3}$ (aq) (Limted amount
$N H_{3}$ (aq) (Limted amount
$N H_{3}$ (aq) (excess amount)	$[P b (N H_{3})_{4}] S O_{4}$	$[C u (N H_{3})_{4}] S O 4$	$[F e (N H_{3})_{6}]_{2} (S O_{4})_{3}$	$[C o (N H_{3})_{4}] S O_{4}$	$[Z n (N H_{3})_{4}] S O_{4}$
$N H_{3}$ (aq) (excess amount)